Clinical practice guidelines of the European Association for Endoscopic Surgery (EAES) on bariatric surgery : update 2020 endorsed by IFSO-EC, EASO and ESPCOP - Di Lorenzo, Nicola (University of Rome "Tor Vergata". Department of Surgical Sciences) ; Antoniou, Stavros A.. (Department of Surgery, Mediterranean Hospital of Cyprus, Limassol, Cyprus) ; Batterham, Rachel L. (National Institute of Health Research. Biomedical Research Centre) ; Busetto, Luca (University Hospital of Padova (Pàdua, Itàlia)) ; Godoroja, Daniela (Department of Anesthesiology, Ponderas Academic Hospital Regina Maria, Bucharest, Romania) ; Iossa, Angelo ("La Sapienza" University of Rome-Polo Pontino, Bariatric Centre of Excellence IFSO-EC. Department of Medical-Surgical Sciences and Biotechnologies, Faculty of Pharmacy and Medicine) ; Carrano, Francesco Maria (Department of Endocrine and Metabolic Surgery, University of Insubria, Ospedale di Circolo and Fondazione Macchi, ASST Sette Laghi, Varese, Italy) ; Agresta, Ferdinando (Department of General Surgery, ULSS5 del Veneto, Adria, Italy) ; Alarçon, Isaias (Hospital Universitario Virgen del Rocío (Sevilla, Andalusia)) ; Azran, Carmil (Herzliya Medical Center) ; Bouvy, Nicole (Maastricht University Medical Centre. Department of Surgery) ; Balaguè Ponz, Carmen (Universitat Autònoma de Barcelona. Departament de Cirurgia) ; Buza, Maura (Ponderas Academic Hospital Regina Maria (Bucarest, Romania)) ; Copaescu, Catalin (Ponderas Academic Hospital Regina Maria (Bucarest, Romania)) ; De Luca, Maurizio (Division of General Surgery, Castelfranco and Montebelluna Hospitals, Treviso, Italy) ; Dicker, Dror (Tel Aviv University. Department of Internal Medicine D, Hasharon Hospital, Rabin Medical Center, Sackler School of Medicine) ; Di Vincenzo, Angelo (University Hospital of Padova (Pàdua, Itàlia)) ; Felsenreich, Daniel M. (Vienna Medical University. Division of General Surgery, Department of Surgery) ; Francis, Nader K. (Yeovil District Hospital NHS Foundation Trust. Department of General Surgery) ; Fried, Martin (Center for Treatment of Obesity and Metabolic Disorders, OB Klinika, Prague, Czech Republic) ; Gonzalo Prats, Berta (Institut d'Investigació Biomèdica Sant Pau) ; Goitein, David (Chaim Sheba Medical Center (Israel)) ; Halford, Jason C. G. (University of Liverpool. Department of Psychological Sciences, Institute of Psychology, Health and Society) ; Herlesova, Jitka (Center for Treatment of Obesity and Metabolic Disorders, OB Klinika, Prague, Czech Republic) ; Kalogridaki, Marina (General Hospital of Attica "KAT". Emergency Department) ; Ket, Hans (VU Amsterdam) ; Morales Conde, Salvador (Hospital Universitario Virgen del Rocío (Sevilla, Andalusia)) ; Piatto, Giacomo (Division of General Surgery, Castelfranco and Montebelluna Hospitals, Treviso, Italy) ; Prager, Gerhard (Vienna Medical University. Division of General Surgery, Department of Surgery) ; Pruijssers, Suzanne (Maastricht University Medical Centre. Department of Surgery) ; Pucci, Andrea (National Institute of Health Research. Biomedical Research Centre) ; Rayman, Shlomi (Chaim Sheba Medical Center (Israel)) ; Romano, Eugenia (University of Liverpool. Department of Psychological Sciences, Institute of Psychology, Health and Society) ; Sanchez-Cordero, Sergi (Consorci Sanitari de L'Anoia (Igualada, Catalunya). Departament de Cirurgia General) ; Vilallonga, Ramon (Universitat Autònoma de Barcelona. Departament de Cirurgia) ; Silecchia, Gianfranco ("La Sapienza" University of Rome-Polo Pontino, Bariatric Centre of Excellence IFSO-EC. Department of Medical-Surgical Sciences and Biotechnologies, Faculty of Pharmacy and Medicine)