1. Department of Health Education and Promotion
2. Care and Public Health Research Institute
3. Nutrition and Toxicology Research Institute
4. Department of General Practice, Maastricht University, Maastricht
5. Department of Cardiology, University Hospital Maastricht, Maastricht, The Netherlands
6. Regional Public Health Institute, Maastricht
7. Bernhoven Hospital, Oss, The Netherlands.