About the Authors

Ondrej Cinek

Ondrej.Cinek@Lfmotol.cuni.cz

Affiliation 2nd Faculty of Medicine, Department of Paediatrics, Charles University in Prague and University Hospital Motol, Prague, The Czech Republic

German Tapia

Affiliation Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway

Elisabet Witsø

Affiliation Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway

Lenka Kramna

Affiliation 2nd Faculty of Medicine, Department of Paediatrics, Charles University in Prague and University Hospital Motol, Prague, The Czech Republic

Katerina Holkova

Affiliation 2nd Faculty of Medicine, Department of Paediatrics, Charles University in Prague and University Hospital Motol, Prague, The Czech Republic

Trond Rasmussen

Affiliation Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway

Lars C. Stene

Affiliation Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway

Kjersti S. Rønningen

Affiliation Oslo University Hospital, Rikshospitalet, Oslo, Norway

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: OC GT EW. Performed the experiments: OC GT LK KH. Analyzed the data: OC LCS. Contributed reagents/materials/analysis tools: OC GT EW TR LCS KSR. Wrote the paper: OC GT EW LCS KSR. Informatics and statistics: TR.