About the Authors

Mart L. Stein

m.l.stein-2@umcutrecht.nl

Affiliations Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands, Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven, The Netherlands

Jim E. van Steenbergen

Affiliations Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven, The Netherlands, Centre for Infectious Diseases, Leiden University Medical Centre, Leiden, The Netherlands

Vincent Buskens

Affiliation Faculty of Social and Behavioural Sciences, University Utrecht, Utrecht, The Netherlands

Peter G. M. van der Heijden

Affiliations Faculty of Social and Behavioural Sciences, University Utrecht, Utrecht, The Netherlands, Southampton Statistical Sciences Research Institute, University of Southampton, Southampton, United Kingdom

Charnchudhi Chanyasanha

Affiliation Department of Microbiology, Faculty of Public Health, Mahidol University, Bangkok, Thailand

Mathuros Tipayamongkholgul

Affiliation Department of Epidemiology, Faculty of Public Health, Mahidol University, Bangkok, Thailand

Anna E. Thorson

Affiliation Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden

Linus Bengtsson

Affiliations Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden, Flowminder Foundation, Stockholm, Sweden

Xin Lu

Affiliations Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden, College of Information System and Management, National University of Defense Technology, Changsha, China, Flowminder Foundation, Stockholm, Sweden

Mirjam E. E. Kretzschmar

Affiliations Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands, Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven, The Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MLS JES VB PGMH CC MT MEEK. Performed the experiments: MLS JES VB CC MT MEEK. Analyzed the data: MLS JES VB PGMH MEEK. Developed questionnaires: MLS JES CC MT MEEK. Developed the web based RDS survey system: MLS AET LB XL. Wrote the paper: MLS JES VB PGMH MEEK.