1. Department of Dermatology; Academic Medical Center; Meibergdreef 9 1105 AZ Amsterdam the Netherlands
2. Department of Dermatology; Erasmus Medical Center; 3015 CA Rotterdam the Netherlands
3. Department of Dermatology; Amphia Hospital; Molengracht 21 4818 CK Breda the Netherlands
4. Clinical Research Unit; Academic Medical Center; Meibergdreef 9 1105 AZ Amsterdam the Netherlands
5. Department of Dermatology; UMC St Radboud; René Descartesdreef 1 6525 GL Nijmegen the Netherlands
6. Department of Dermatology; UMC Groningen; Hanzeplein 1 9713 GZ Groningen the Netherlands
7. Medical Psychology and Psychotherapy Section; Erasmus Medical Center; 3015 CA Rotterdam the Netherlands