1. Department of Epidemiology; Maastricht University, CAPHRI School for Public Health and Primary Care; Maastricht the Netherlands
2. South Limburg Public Health Service; Geleen the Netherlands
3. Department of Social Medicine; Maastricht University, CAPHRI School for Public Health and Primary Care; Maastricht the Netherlands
4. Department of General Practice; Maastricht University, CAPHRI School for Public Health and Primary Care; Maastricht the Netherlands