[1] Erasmus MC Canc Inst, Dept Surg Oncol, Groene Hilledijk 301, NL-3075 EA Rotterdam, Netherlands
[2] Netherlands Canc Inst Antoni van Leeuwenhoek, Dept Surg, Amsterdam, Netherlands
[3] Univ Groningen, Univ Med Ctr Groningen, Dept Surg Oncol, Groningen, Netherlands
[4] Maria Sklodowska Curie Mem Canc Ctr & Inst Oncol, Dept Soft Tissue Bone Sarcoma & Melanoma, Warsaw, Poland
[5] St Georges Fdn Univ Hosp, Melanoma Unit, London, England
[6] Canc Inst Gustave Roussy, Dept Dermatol & Allergol, Villejuif, France
[7] Canc Inst Gustave Roussy, Board Directors, Villejuif, France
[8] European Inst Oncol, Div Dermatooncol Surg, Milan, Italy
[9] Charite, Dept Dermatol & Allergol, Berlin, Germany