1. Department of Dermatology; Academic Medical Center; University of Amsterdam; Meibergdreef 9 1105 AZ Amsterdam the Netherlands
2. Dutch Skin Foundation; Utrecht the Netherlands
3. NIVEL (Netherlands Institute for Health Services Research); Utrecht the Netherlands
4. VU Medical Center; Department of Dermatology; Amsterdam the Netherlands
5. Department of Medical Psychology; Academic Medical Center; University of Amsterdam; Meibergdreef 9 1105 AZ Amsterdam the Netherlands