1. Department of Family Medicine; Maastricht University Medical Centre; Maastricht The Netherlands
2. Department of Dermatology; Maastricht University Medical Centre; Maastricht The Netherlands
3. General Practice; Health Care Centre Heer; Maastricht The Netherlands
4. GROW Research Institute for Oncology and Developmental Biology; Maastricht The Netherlands
5. CAPHRI School for Public Health and Primary Care; Maastricht University; Maastricht The Netherlands