[1] Ludwig Maximilian Univ Munich, Dept Dermatol & Allergol, Munich, Germany
[2] A Businco Oncol Hosp, Oncol Surg, Cagliari, Italy
[3] Univ Pavia, IRCCS Policlin San Matteo Fdn, Dept Otolaryngol Head Neck Surg, Pavia, Italy
[4] Copenhagen Univ Hosp Herlev, Dept Oncol, Herlev, Denmark
[5] Gentofte, Herlev, Denmark
[6] Univ Padua, Dept Surg Oncol & Gastroenterol Sci DISCOG, Padua, Italy