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Differences in Weight Status and Energy-Balance Related Behaviors among Schoolchildren across Europe: The ENERGY-Project

  • Johannes Brug ,

    Affiliation Department of Epidemiology and Biostatistics and EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands

  • Maartje M. van Stralen,

    Affiliation Department of Public and Occupational Health and EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands

  • Saskia J. te Velde,

    Affiliation Department of Epidemiology and Biostatistics and EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands

  • Mai J. M. Chinapaw,

    Affiliation Department of Public and Occupational Health and EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands

  • Ilse De Bourdeaudhuij,

    Affiliation Department of Movement and Sport Sciences, Ghent University, Ghent, Belgium

  • Nanna Lien,

    Affiliation Department of Nutrition, University of Oslo, Norway

  • Elling Bere,

    Affiliation Department of Public Health, Sport and Nutrition, University of Agder, Kristiansand, Norway

  • Victoria Maskini,

    Affiliation Department of Nutrition and Dietetics, Harokopio University, Athens, Greece

  • Amika S. Singh,

    Affiliation Department of Public and Occupational Health and EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands

  • Lea Maes,

    Affiliation Department of Public Health, Ghent University, Ghent, Belgium

  • Luis Moreno,

    Affiliation GENUD (Growth, Exercise, Nutrition and Development) Research Group. E.U. Ciencias de la Salud, Universidad de Zaragoza, 50009 Zaragoza, Spain

  • Nataša Jan,

    Affiliation Slovenian Heart Foundation, Ljubljana, Slovenia

  • Eva Kovacs,

    Affiliation Department of Paediatrics, Pecs University, Pecs, Hungary

  • Tim Lobstein,

    Affiliation IASO, International Association for the Study of Obesity, London, United Kingdom

  • Yannis Manios

    Affiliation Department of Nutrition and Dietetics, Harokopio University, Athens, Greece



Current data on the prevalence of overweight and energy-balance behaviors among European children is necessary to inform overweight prevention interventions.

Methodology/Principal Findings

A school-based survey among 10–12 year old children was conducted in seven European countries using a standardized protocol. Weight, height, and waist circumference were measured; Engagement in physical activity, sedentary and dietary behaviors, and sleep duration were self-reported. Descriptive analyses were conducted, looking at differences according to country, gender, and parental education. 7234 children (52%girls; 11.6±0.7 years) participated. 25.8% and 5.4% of boys, and 21.8% and 4.1% of girls were overweight (including obese) and obese (according to International Obesity Task Force criteria), respectively. Higher prevalence of overweight/obesity was observed in Greece, Hungary, Slovenia and Spain than in Belgium, Netherlands and Norway. Large differences between countries were found in intakes of sugar-sweetened beverages, breakfast, active transport, TV and computer time. More favorable overweight status and behavior patterns were found in girls than boys and in children of higher educated parents than in children of lower educated parents.


High levels and striking differences in overweight status and potential risk behaviors were found among schoolchildren across Europe.


Overweight and obesity are important determinants of avoidable burden of disease [1], [2]. Overweight and obesity track from childhood into adulthood [3], [4]. Preventing overweight and obesity and promoting healthy energy-balance related behaviors (EBRB) during childhood are therefore important health policy priorities in Europe and beyond. To curb the obesity epidemic, up-to-date data on prevalence of overweight, obesity, associated EBRBs and groups at risk for overweight is essential. In earlier studies large differences in childhood overweight and obesity between European countries have been reported [5]. However, data of these overviews come from different studies, conducted in different years, are outdated for some countries [6], or relied on self-reported weight and height [7], [8].

Recent reviews suggest that high intakes of sugar sweetened beverages, breakfast skipping, lack of physical activity, high levels of ‘screen time’ (e.g. watching TV, or playing e-games), and lack of sleep [9], [10] are associated with overweight and obesity among school-aged children [11][14]. Earlier research indicate that the prevalence of overweight and EBRB differ between girls and boys and is considerably higher among youth from lower socio-economic backgrounds [7], [15][26]. Cross-European studies providing insight into engagement in EBRBs assessed by standard methodology, and their socio-demographic correlates are lacking. The present study presents data from the “EuropeaN Energy balance Research to prevent excessive weight Gain among Youth” (ENERGY)-project on measured weight status and reported EBRB among 10–12 year olds in and differences between seven European countries [27]. The specific research questions are:

  1. What are the distributions and differences in body mass index (BMI), waist circumference (WC), overweight and obesity in schoolchildren in seven countries across Europe?
  2. What are the distribution and differences in dietary, physical and sedentary activities and sleeping duration in these countries across Europe?
  3. What are differences in anthropometrics and EBRB according to sex and parental education across different countries in Europe?


A description of the rationale and organization of the ENERGY-project [27] and a comprehensive description of the design, procedures, and methodology of the ENERGY school-based survey [28] are published elsewhere. The data collection manual and survey questionnaires for the Energy cross-sectional survey are available online The project adhered to the Helsinki Declaration and the conventions of the Council of Europe on human rights and biomedicine. All participating countries obtained ethical clearance from the relevant ethical committees and ministries. in Belgium the survey was approved by the Medical Ethics Committee of the University Hospital.

Ghent; in Greece the survey was approved by the Bioethics Committee of Harokopio University; in Hungary the survey was approved by the Scientific and Ethics Committee of Health Sciences Council; in The Netherlands the survey was approved by the Medical Ethics Committee of the VU University medical center; in Norway the survey was approved by the National Committees for Research Ethics in Norway; in Slovenia the survey was approved by the National Medical Ethics Committee of the Republic of Slovenia; and in Spain the survey was approved by Clinical Research Ethics Committee of the Government of Aragón. Furthermore, research permission was, if necessary, obtained from local school authorities (local school boards and/or headmasters).

Sampling and Respondents

The school-based survey was carried out between March and July 2010 in Belgium, Greece, Hungary, the Netherlands, Norway, Slovenia, and Spain, among pupils in the final years of primary education (aged 10–12 years). These seven countries were selected to provide variation across regions in Europe and thus variation in potential obesogenic behaviors and prevalence of overweight and obesity. Inclusion of more countries across Europe was not possible because of budgetary restraints. Based on previous cross-European studies (e.g. the Pro-Children study [29]) a minimum sample of 1,000 schoolchildren per country and one parent/caretaker for each child was aimed for. Equal numbers of participants from each country were included to allow between country comparisons. Sampling was national in Greece, Hungary, the Netherlands, and Slovenia. In Spain, schools in the region of Aragón were selected; Belgium selected schools from Flanders and Norway selected schools from the southern regions of the country [28]. Within each country or region, three provinces were randomly selected from each of the lowest, mid and highest tertiles of degree of urbanisation (i.e. the percentage of inhabitants living in towns of >20,000 persons). A municipality of >20,000 inhabitants from each selected province was randomly chosen, with schools randomly selected for inclusion in the study from all schools in that municipality. The clustering of the survey was taken into account in sample size calculations.

A school recruitment letter was sent to the headmaster or principal of the sampled schools, followed by a personal telephone call. Following the school’s agreement, parents received a letter explaining the study purpose and were asked for written consent for their child’s and own participation.


Measurements were conducted according to standardized protocols. Dietary, physical activity and screen viewing behaviors were assessed by the child questionnaire. Child’s sleep duration was reported by the parent. The children completed questionnaires and anthropometric measurements during school time. Test-retest reliability was tested by administrating the questionnaire twice with a one week interval among 720 schoolchildren across the participating countries. The intraclass coefficients and percentage agreement was good to excellent for 77% of items and construct validity was moderate to excellent for 73% of the items [30]. In the paragraphs hereafter information on the Intraclass coefficients (ICC) is provided for the specific questionnaire items. Detailed information regarding the procedures, training of research staff, development of the questionnaire [28], and test- retest reliability and construct validity [30] is published elsewhere.

Weight, Height and waist-circumference (WC).

Body height, weight, and WC were measured by trained research assistants. The children were measured in light clothing without shoes. Body height was measured with Seca Leicester Portable stadiometer (accuracy of 0.1 cm). Weight was measured with a calibrated electronic scale SECA 861 (accuracy of 0.1 kg), WC with the SECA 201 measuring band (accuracy 0.1 cm). Two readings of each measurement were obtained. If the two readings differed more than 1%, a third measurement was taken. Body mass index (BMI) and overweight status (overweight, obesity) based on the International Obesity Task Force criteria (IOTF) [31] as well as the WHO criteria [32] were calculated to enable comparison with other studies that applied either of these criteria.

Dietary behaviors.

Intakes of soft drinks and fruit juices were each assessed with two food frequency questions (FFQ). First children were asked on how many days per week they drank the beverage on a seven point scale ranging from never to more than once every day (ICC soft drink = 0.72; ICC fruit juice = 0.64). Subsequently they were asked to indicate how much they drank on days they consumed the beverage by ticking the number of glasses (or small bottles, i.e. 250 ml; ICC = 0.59), cans (i.e. 330 ml; ICC = 0.53)) and/or large bottles (i.e. 500 ml; ICC = 0.59) for soft drinks, or glasses/small cartons (250 ml; ICC = 0.54) and/or regular cartons (330 ml; ICC = 0.52) for fruit juices. Pictures of the serving sizes were printed in the questionnaire. Mean intake in ml per day was calculated from the FFQ by multiplication of number of days per week and amount per day in ml divided by 7. Additionally, children were asked to indicate how much of the beverages they had consumed on the day before questionnaire administration, again by ticking the number of glasses (ICC = 0.58), cans (ICC = 0.53) and/or bottles (ICC = 0.55) for soft drinks, and glasses (ICC = 0.48) and/or cartons (ICC = 0.35) for juice.

Breakfast habits were assessed by two questions asking the children on how many schooldays per week (ICC = 0.73) and on how many weekend days (ICC = 0.52) they normally had breakfast. Breakfast frequency per week was calculated by adding up the answers of the two questions. The frequency score was recoded into a skipping breakfast score ([0] had breakfast 7 days/week; [1] had breakfast 0–6 times/week).

Physical activity behaviors.

Transport to school was assessed by two questions about how many days per week the child cycled (ICC = 0.94) or walked (ICC = 0.91) to school (from never [0] to 5 days/week [5]) and two questions on how long the bike ride (ICC = 0.81) or walk (ICC = 0.70) to school was (4 answering categories, from 1–5 minutes to more than 15 minutes). Total bike/walk time per week was calculated by multiplying the number of days with the mean time of the answering category times 2 (i.e. it was assumed that if a child cycled or walked to school, the same mode of transportation was taken on the way back). Total active transport was calculated by adding up total bike and walk times. Finally, a question was included on what mode of transportation was used to get to school on the day of administration (ICC = 0.79).

Regarding organized sports participation, questions were included on how many hours per week children participated in sports for two sports (ICC = 0.74 for sport 1; ICC = 1.00 for sport 2). Based on the answers average time of sport participation per week was calculated for each child.

Sedentary behaviors and sleeping.

Screen time questions (i.e. TV and computer time) were asked about time spent watching TV (including video and DVD;) and computer (PC) activities for weekdays (ICCs = 0.67 for TV and for PC) and weekend days (ICCs = 0.68 for TV and 0.67 for PC) separately using a categorical scale ([0] not at all, [0.5] 30 minutes per day… [4] 4 hours per day). Mean TV, PC and total screen time per day were calculated. Finally, the children were asked to indicate how much they spent watching TV (ICC = 0.68) or used the computer (ICC = 0.54) the day before questionnaire administration.

The child’s sleep habits were reported by the parent about how many hours the child sleeps on average per night, separately for weekdays (ICC = 0.81) and weekend days (ICC = 0.78). A mean number of hours of sleep per day was calculated.

Parental education was also assessed in the Parent Questionnaire. Parents were asked to report their own level of education and that of the other parent/caregiver. Both scores were combined, and dichotomized into low (0, both parent/caregivers with fewer than 14 years of education) and high (at least one parent/caregiver with 14 or more years of education).


Multivariate Analyses of Variance (MANOVA) were performed to assess differences in means or proportions according to country, gender and parental education with anthropometrics (i.e. BMI, WC, % overweight/obese, according to IOTF as well as WHO criteria) and potential risk behaviors as dependent variables and country, sex and parental education as factors, and with age as a covariate. For the dependent variables that showed significant results, subsequent pairwise comparisons by means of ANOVAS with Bonferoni correction were conducted. For EBRBs means and standard deviations are reported, but because of skewed distributions, a table with median values is made available as an additional file (see Tables S1 and S2). Differences according to gender and parental education were tested in each country separately.


Participant Characteristics

Between 15 (Slovenia) and 37 (Greece) schools participated, with a wide range in response rates at school level (see Table 1). Response rates at the child level were in general high (>80%), except for Hungary, Norway and Spain where lower response rates were obtained, mainly because of lack of parental consent. Almost all children who completed the questionnaire also participated in anthropometrics measurements. For the parent questionnaire high response rates were obtained except for Belgium and the Netherlands (see Table 1). The total sample comprised 7,234 children (Mean age 11.6±0.7 years, 52% girls).

Table 1. Overview of data collection and response rates per country.


Multivariate Analyses of Variance revealed a significant multivariate main effect on the antropometric variables for country (Willk’s λ = 0.88, F (36, 30878.0) = 25.07, p<0.00), gender (Willk’s λ = 0.93, F(6.0, 7036.00) = 91.31, p<0.00), and parental education (Willk’s λ = 0.98, F(6.0, 5082.00) = 14.85, p<0.00).

Across the countries, 25.8 and 5.4% of the boys, and 21.8 and 4.1% of the girls were overweight (including obesity) and obese, respectively (Table 2). Mean BMI varied between 18.3 kg/m2 (Belgium) and 20.6 kg/m2 (Greece) for boys and 18.1 kg/m2 (Belgium) and 20.3 kg/m2 (Greece) for girls. Highest WCs were observed in Greece – both in boys and girls; the lowest WCs were found in the Netherlands and Belgium. The difference in WC between Greece and the Netherlands was almost 8 cm for boys and 7 cm for girls. The highest prevalence of overweight (including obesity) was also observed in Greece, and the lowest in Belgium (Girls) and Norway (Boys). In Belgium, Norway, and the Netherlands prevalence rates were significantly lower than other countries. All countries had significantly lower prevalence of overweight/obesity than Greece. Similar patterns were found for obesity separately, but in Spain low obesity rates were observed despite a relatively high overweight prevalence. Significantly higher overweight prevalence was observed in boys than in girls in the whole sample. Children of high educated parents had a lower BMI and WC and were less likely to be overweight or obese than children of lower educated parents (Table 2, bottom half). These differences showed similar patterns across countries.

Table 2. Means, standard deviations (SD) for Body Mass Index (BMI) and waist circumference (WC) and percentage overweight and obese (using IOTF and WHO criteria) in each of the participating countries, for boys and girls separately and for children with low educated and high educated parents separately.

Energy-balance Related Behaviors

MANOVA showed a significant multivariate main effect on the energy balance related behaviors for country (Willk’s λ = 0.242, F(102.00, 28716.63) = 79.626, p<0.00), gender (Willk’s λ = 0.921, F(17.00, 5041.00) = 25.276, p<0.00), and parental education (Willk’s λ = 0.937, F(17.0, 4456.00) = 17.59, p<0.00).

Dietary behaviors.

Table 3 (Means and standard deviations) and Table S1 (Medians and quartiles), show large differences across countries in dietary behaviors as identified by the post-hoc analyses of variance. Based on the 24-h recall questions, soft drink intake ranged from more than 600 ml/day among Hungarian and Dutch boys to less than 150 ml/day in Greek and Spanish girls. In all countries except Hungary, boys had significantly higher intakes than girls. Fruit juice intake was high in Dutch boys, bringing their mean sugary drinks consumption to more than one liter/day. Gender differences in fruit juice consumption appeared to be smaller than for soft drinks. The FFQ assessments resulted in somewhat higher mean intake, but in similar patterns regarding country comparisons (lower 24-h recall results may be due to questionnaire assessments not being done on Mondays, therefore excluding weekend days from the 24-h recall assessment).

Table 3. Means and standard deviations (SD) for dietary behaviors in each of the participating countries, for boys and girls separately and for children with low educated and high educated parents separately.

Mean number of days/week having breakfast ranged from 6.7 among Spanish girls to 5.1 among Slovenian girls. In Slovenia the highest prevalence (>50%) of skipping breakfast on one or more days per week was reported.

Children of lower educated parents reported less favorable intakes regarding soft drink, fruit juice, and breakfast than children of higher educated parents (Table 3 bottom half and Table S2), in the separate country analyses.

Physical activity behaviors.

With an average of more than 40 minutes/week, children in Norway and Netherlands spent much more time cycling to school than children in other countries (Table 4 and Table S1). In Belgium, cycling is also a relevant active transportation mode. In general, girls cycled significantly fewer days per week to school than boys, but no significant gender differences in weekly minutes of cycling were found. Spanish and Norwegian girls reported the most minutes of walking to school. In general, girls reported more weekly minutes of walking to school than boys. No significant differences according to parental education in total active transport were observed (Table 5 and Table S2), however, differences were found in specific transport behaviors: children with low parental education were less likely to bike, but were more likely to walk to school.

Table 4. Means and standard deviations (SD) for physical activity in each of the participating countries, for boys and girls separately.

Table 5. Means and standard deviations (SD) for physical activity behaviors in each of the participating countries, for children with low educated and high educated parents separately.

For engagement in sport activities, boys reported on average 260 minutes/week ranging from more than 300 minutes/week in Norway to less than 200 minutes/week in Greece. Girls reported on average almost 200 minutes/week, ranging from 250 minutes/week in Slovenia to less than 150 minutes/week in Greece. Girls reported lower engagement in sport across all countries. Children of higher educated parents participated significantly more in sports than those from lower educated parents.

Sedentary behaviors and sleeping.

Across the countries boys reported spending about 2½ hours and girls somewhat less than 2 hours on screen-viewing activities (TV and computer-time combined) in 24-h recall; girls in Spain reported the lowest screen time (table 6). In all countries mean total screen time, as well as TV and computer time were higher for boys than girls. The results based on the frequency questions were similar although somewhat higher. Again lower 24-h recall results may be due to the fact that questionnaire administration was not done on Mondays, therefore excluding weekend days (often with more time spend in screen activities) from the 24-h recall assessment. Children of higher educated parents reported less screen time than those from lower educated parents: less time watching TV, using the computer, as well as total screen time (table 6 bottom half and Table S2).

Table 6. Means and standard deviations (SD) for sedentary behaviors in each of the participating countries, for boys and girls separately and for children with low educated and high educated parents separately.

Parents of boys and girls reported on average that their child slept 9.2 hours/night. This varied between 8.7 hours for Greek boys to 9.7 hours for Belgian girls. Significantly less hours of sleep were reported for Greek boys and girls than in all the other countries (Table 6 and Table S1). No significant differences in sleeping behavior were reported between boys and girls or between high and lower educated parents (Table 6 and Table S2).


The prevalence of measured overweight -including obesity- across seven countries from different regions in Europe was 25.8% and 21.8% (IOTF) or 34.6% and 26.8% (WHO) for boys and girls respectively. The patterns in differences in overweight and obesity were similar for IOTF and WHO criteria, but WHO criteria resulted in somewhat to substantially higher prevalence rates. The prevalence of overweight was much higher than reported for the same seven countries in the Health Behavior in School-aged Children (HBSC) report [33]. HBSC relied, however, on self-reported weight and height, and the data are between 4–5 years older. Our finding that overweight prevalence as well as engagement in some of the ‘risk’ behaviors was higher in the included countries in southern and central European region than in the countries located in the Northwest of Europe is in line with other studies including HBSC [7]. It may be that the overweight rise is ‘leveling off’ in some countries [34], but the present prevalence remains higher than desirable and unacceptably high in some countries. Although the overweight prevalence in Greek boys of more than 40% is especially worrisome, the prevalence in all countries calls for action, especially when the results regarding the EBRB are taken into account.

Across all countries children engage frequently in dietary, (lack of) physical activity and sedentary behaviors that are regarded as potential risk behaviors for becoming overweight obese, with large differences between countries. Many children skipped breakfast on one or more days per week, especially in Greece and Slovenia, and the mean intakes of sugar-sweetened beverages in the Netherlands, Hungary and Slovenia was high. Low levels of active transport were reported especially in Belgium, Slovenia and Hungary, while low levels of sports were reported in Greece. Norwegian children reported the most minutes of cycling and walking to school. This is probably partly due to over-reporting due to the large seasonal differences in Norway. Norwegian children tend to cycle to school in summer, and walk to school in winter [35], and they probably reported their usual pattern for both seasons. Also in other countries some children reported active transport activities to school on more than five times per week. It may be that these children cycled to school and walked back, commuted to school more than once per day, or had other valid reasons, so total active transport time needs to be interpreted with caution.

For sedentary behaviors, screen activities were high in all countries, wherein children spent on average more than 2 hours/day in TV and computer activities. The results also indicate that children’s screen time is quite close to being equally divided between TV and other screen-viewing behaviors, confirming that sedentary behavior interventions should not be restricted to TV time only.

Furthermore, we found that overweight and participation in the potential risk behavior was more prevalent in boys than girls, with the exception of sports activities. In addition, overweight and potential risk behaviors are generally more likely in children of parents with fewer years of formal education. The difference in prevalence of overweight and risk behaviors according to parental education in Slovenia appeared to be especially worrisome and the educational disparities and differences in these disparities across Europe requires further research. In-depth analyses (not presented in this study) showed that these patterns were similar for both boys and girls. This supports earlier studies [7] indicating that interventions aimed at preventing overweight and obesity in school-aged children should pay specific attention to boys and children of low educated parents.

The study has some limitations. First, differences in response rates at school and student level were apparent, which may have reduced the external validity of the findings. The fact that schools were especially difficult to recruit in the Netherlands is in line with other school-based research in this country in recent years. There is a great emphasis on youth health research. Some school-based research is obligatory (i.e. as conducted by municipal health services [36] and participation in many additional school-based research is requested. Schools are therefore more and more reluctant to participate. Although the Dutch results are in line with other data regarding overweight and obesogenic behaviors in this age group in the Netherlands [37], [38] the Dutch data should be interpreted with extra caution. The fact that response rates at the child level were lower in Hungary, Norway and Spain was mostly because parents did not provide active parental informed consent. This may have resulted in participation of children from parents who are more interested in issues regarding obesity prevention, and thus to biased results. Parental data in the Netherlands might be biased to higher levels of education, which may have resulted in lower overall levels of overweight and obesity for this country.

Furthermore, data on dietary, physical activity and sedentary behavior were based on self-reports, and thus possibly biased. Nevertheless, the measures showed good test-retest reliability and construct validity [30], and for some behaviors both 24-h recall and frequency questions were included- that showed similar results. The intraclass coefficients for the 24-h recall questions were lower than for the frequency questions; this was to be expected because behavior in the last 24 hours (24-h recall) is likely to vary more than usual behavior as assessed by the frequency questions. Further, in the present study the measure of physical activity behavior did not capture participation in all physical activities, and only included measures of active transport and sports participation. Additionally, active transport was restricted to transport to and from schools. This means that our results do not represent total active travel. It may, however, be likely that children who use active transportation to school may also be more likely to go by bike or foot to other destinations. Future research will be conducted to examine which behavioral, cognitive, and environmental factors are associated with the differences in overweight indices and EBRBs across and within the countries. Finally, the potential risk behaviors included in the present study are not proven causes of adiposity among schoolchildren. The evidence regarding these potential risk behaviors is largely based on observational research that only allow conclusions regarding associations rather than causation.

Strengths of the present study include the large multinational sample from different regions across Europe, the standardized data collection protocol across the different countries, measured weight, height and waist circumference, and the inclusion of a large range of potential EBRBs, including sedentary behaviors and sleep duration.

In conclusion, prevalence of overweight is high across Europe among school-aged children, with especially worrisome prevalence in Greece. Many children engage frequently in dietary, physical activity and sedentary behaviors that are associated with the likelihood of becoming overweight and obese, with large differences in such behaviors between countries and region. Region or country-specific policies and interventions are needed to contribute to curbing the overweight epidemic in European schoolchildren.

Supporting Information

Table S1.

Medians and 25–75% percentiles for dietary, physical activity and sedentary behaviors in each of the participating countries, for boys and girls.


Table S2.

Medians and 25–75% quartiles for dietary, physical activity and sedentary behaviors in each of the participating countries, for children with low educated and high educated parents.


Author Contributions

Conceived and designed the experiments: JB STV AS MC EB YM. Performed the experiments: JB MVS STV MC IDB NL EB VM AS L. Maes L. Moreno NJ EK TL YM. Analyzed the data: JB MVS STV. Contributed reagents/materials/analysis tools: JB MVS STV MC IDB NL EB VM AS L. Maes L. Moreno NJ EK TL YM. Wrote the paper: JB. Provided feedback on drafts of the manuscript: MVS STV MC IDB NL EB VM AS L. Maes L. Moreno NJ EK TL YM.


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