1 Rare Tumors and Melanoma Unit, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Istituto Tumori Giovanni Paolo II, Bari, Italy.
2 Dermatologic Clinic, University of Turin Medical School, University of Turin, Turin, Italy.
3 Melanoma, Sarcoma and Rare Tumors Oncology Department, European Institute of Oncology (IEO), Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan, Italy.