1. Hepatic Pancreatic and Biliary Surgical Unit, San Salvatore Hospital, Department of Biothecnological and Applied Clinical Sciences, University of L’Aquila, 67100 L’Aquila, Italy
2. ELSAN, Clinique Saint Michel, Centre de Chirurgie de l’Obésité (CCO), 83100 Toulon, France
3. Department of Digestive and Bariatric Surgery, Clinica Madonna della Salute, 45014 Porto Viro, Italy
4. Clinique Geoffroy-Saint Hilaire, Générale de Santé (GDS), Department of Digestive and Bariatric Surgery, 75005 Paris, France
5. Department of Digestive and Bariatric Surgery, Centre Hospitalier Universitaire de Martinique, 97261 Fort-de-France, France
6. Department of Digestive and Metabolic Surgery, Groupe Hospitalier Diaconesses Croix Saint-Simon, 75012 Paris, France
7. Public Health Unit, Department of Biotechnological and Applied Clinical Sciences, University of L’Aquila, 67100 L’Aquila, Italy
8. Department of Surgery, IRCCS Regina Elena National Cancer Institute, 00144 Rome, Italy
9. General Surgical Unit, San Salvatore Hospital, Department of Biotechnological and Applied Clinical Sciences, University of L’Aquila, 67100 L’Aquila, Italy