1 Department of Gastroenterologic, Endocrine-Metabolic and Nephro-Urologic Sciences, Endocrine Surgery Division, Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Rome, Italy.
2 PhD ICHT, University of Naples Federico II, 80131 Naples, Italy.
3 Department of Cardiothoracic Sciences, University of Campania "Luigi Vanvitelli", Division of General and Oncologic Surgery, Via Pansini 5, 80131 Napoli, Italy.