1. Department of Dermatology; Radboud University Medical Center; PO Box 9101 6500 HB Nijmegen the Netherlands
2. Department for Health Evidence; Radboud University Medical Center; PO Box 9101 6500 HB Nijmegen the Netherlands
3. Department of Primary and Community Care; Radboud University Medical Center; PO Box 9101 6500 HB Nijmegen the Netherlands