1. Fondazione Policlinico Universitario A. Gemelli Istituto di Ricovero e Cura a Carattere Scientifico, Università Cattolica del S. Cuore, Rome, Italy
2. Department of Surgical Sciences, Sapienza University of Rome, Rome, Italy
3. Department of Surgery, Azienda Ospedaliera S. Camillo Forlanini, Rome, Italy
4. Department of Medicine III, Universitätsklinikum Carl Gustav Carus an der Technischen Universität Dresden, Dresden, Germany
5. Diabetes and Nutritional Sciences, King's College London, London, United Kingdom