1. Department Tranzo, Academic Collaborative Centre for Public Health Brabant, Tilburg University, Tilburg, The Netherlands
2. Academic Collaborative Centre for Public Health Limburg, Public Health Service South Limburg (GGD ZL), Geleen, The Netherlands
3. Department of Health Services Research, School for Public Health and Primary Care CAPHRI, Maastricht University, Maastricht, The Netherlands
4. National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands