1. Departments of Department of Dermatology Leiden University Medical Center Leidenthe Netherlands
2. Department ofPathology Leiden University Medical Center Leiden the Netherlands
3. Department of Dermatology Academic Medical Center Vrije University Medical Center Amsterdam the Netherlands
4. Department of Dermatology Erasmus Medical Center Rotterdam the Netherlands
5. Department of Dermatology University Medical Center of Groningen Groningen the Netherlands
6. Department of Dermatology Radboud University Medical Center Nijmegen the Netherlands
7. Department of Dermatology University Medical Center Utrecht the Netherlands
8. Department of Dermatology Maastricht University Medical Center Maastricht the Netherlands