1. Department of Dermatology; Radboud University Medical Center; Rene Descartesdreef 1, P.O. Box 9101 6500 HB Nijmegen the Netherlands
2. Dutch Society of Dermatology and Venereology; Domus Medica; Utrecht the Netherlands
3. Department of Dermatology; University Medical Center Utrecht; Utrecht the Netherlands
4. Department of Dermatology; Academic Medical Center; University of Amsterdam; Amsterdam the Netherlands