1. Division of Medical Oncology - Preventive Oncology; Centro di Riferimento Oncologico; National Cancer Institute; Via Franco Gallini, 2 33081 Aviano Italy
2. Department of Dermatology; University of Vienna; Vienna Austria
3. Skin Cancer Unit; Istituto Tumori Romagna (IRST); Meldola Italy
4. Istituto Dermopatico Immacolata; IRCCS; Rome Italy
5. Department of Dermatology; Fondazione Ospedale Maggiore Policlinico IRCCS; Milan Italy
6. Department of Dermatology; University of Florence; Florence Italy
7. Clinic of Dermatology; IRCCS San Martino - Ist; Genoa Italy
8. Dermatologic Clinic; Department of Medical Sciences; University of Turin; Turin Italy
9. Department of Dermatology; University of Siena; Siena Italy
10. Skin Cancer Unit; Arcispedale Santa Maria Nuova IRCCS; Reggio Emilia Italy
11. Unit of Epidemiology and Biostatistics; Centro di Riferimento Oncologico; National Cancer Institute; Via Franco Gallini, 2 33081 Aviano Italy