1 I.R.C.C.S. Ospedale Galeazzi - Sant'Ambrogio, Division of General Surgery, Department of Biomedical Science for Health, University of Milan, Milan, Italy. alberto.aiolfi86@gmail.com.
2 I.R.C.C.S. Ospedale Galeazzi - Sant'Ambrogio, Division of General Surgery, Department of Biomedical Science for Health, University of Milan, Milan, Italy.
3 Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK.
4 IRCCS Policlinico San Donato, Division of General and Foregut Surgery, Department of Biomedical Sciences for Health, University of Milan, Milan, Italy.