1. Department of Dermatology Erasmus Medical Centre Cancer Institute Rotterdamthe Netherlands
2. Department of Dermatology University Medical Centre Groningen Groningen the Netherlands
3. PALGA: The Nationwide Network and Registry of Histology and Cytopathology Houten the Netherlands
4. Department of Pathology Erasmus Medical Centre Cancer Institute Rotterdam the Netherlands
5. Department of Dermatology Isala Hospital Zwolle the Netherlands