1. Department of Dermatology; Radboud University Medical Centre; Nijmegen the Netherlands
2. Department of Dermatology; Ziekenhuisgroep Twente; Almelo/Hengelo the Netherlands
3. Department of Dermatology; St. Anna Ziekenhuis; Geldrop the Netherlands
4. Department of Dermatology; Gelre Ziekenhuizen; Apeldoorn the Netherlands
5. Department of Dermatology; Ziekenhuis Gelderse Vallei; Ede the Netherlands
6. Department of Dermatology; Slingeland Ziekenhuis; Doetinchem the Netherlands
7. Department of Dermatology; Maxima Medisch Centrum; Eindhoven/Veldhoven the Netherlands
8. Department of Dermatology; Jeroen Bosch Ziekenhuis; Den Bosch the Netherlands
9. Department of Health Evidence; Radboud University Medical Centre; Nijmegen the Netherlands