1. Academic Collaborative Center for Public Health Limburg , P.O. Box 33, 6400 AA Heerlen , The Netherlands
2. Department of Health Promotion, Research Institute of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University , P.O. Box 616, 6200 MD Maastricht , The Netherlands
3. Department of Primary and Community Care, Academic Collaborative Center AMPHI, Radboud Institute for Health Sciences, Radboud University Medical Center , P.O. Box 9101, 6500 HB Nijmegen , The Netherlands
4. Department of Healthy Living, Public Health Service Gelderland-Zuid , P.O. Box 1120, 6501 BC Nijmegen , The Netherlands
5. Expertise Center Child Health, Netherlands Organization for Applied Scientific Research (TNO) , P.O. Box 3005, 2301 DA Leiden , The Netherlands
6. Public Health Service Noord- en Oost Gelderland, Academic Collaborative Center AGORA , P.O. Box 3, 7200 AA Zutphen , The Netherlands
7. Department of Health Services Research, Care and Public Health Research Institute (CAPHRI), Maastricht University , P.O. Box 616, 6200 MD Maastricht , The Netherlands