1. Department of Dermatology; Academic Medical Centre; Amsterdam The Netherlands
2. Clinical Epidemiology, Biostatistics and Bioinformatics; Academic Medical Centre; Amsterdam The Netherlands
3. Department of Dermatology; Netherlands Cancer Institute; Amsterdam; The Netherlands
4. Dermatology and Skin Cancer Unit; Arcispedale Santa Maria Nuova - IRCCS/University of Modena and Reggio Emilia; Reggio Emilia Italy
5. Private Dermatology Office/CMB Collegium Medicum Berlin; Berlin Germany
6. Department of Pathology; Academic Medical Centre; Amsterdam The Netherlands
7. Department of Dermatology; VU Medical Centre; Amsterdam The Netherlands