1. Internal Medicine and Metabolic Diseases; Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico; Milano Italy
2. Department of Pathophysiology and Transplantation; Università degli Studi di Milano; Milano Italy
3. Division of Gastroenterology; Department of Medical Sciences; A.O.U. Città della Salute e della Scienza; Università di Torino; Torino Italy
4. Division of Endocrinology; Columbia University; New York NY USA
5. Section of Endocrinology, Diabetes and Metabolism; Department of Medicine; University and Azienda Ospedaliera Universitaria Integrata of Verona; Verona Italy