1. Department of Surgery, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
2. Bariatric Surgery Unit, San Pio X Hospital, Milan, Italy.
3. Department of Cardiology, Azienda Ospedaliera Ospedale Niguarda Ca' Granda, Milan, Italy.
4. San Paolo Bachelor School of Nursing, San Paolo Teaching Hospital, Milan, Italy.
5. Department of Biomedical Sciences for Health, University of Milan, Milan, Italy.