1 Division of General Surgery, Department of Biomedical Science for Health, IRCCS Galeazzi-Sant'Ambrogio, University of Milan, Milan, Italy.
2 Division of General and Foregut Surgery, Department of Biomedical Science for Health, IRCCS Policlinico San Donato, University of Milan, Milan, Italy.
3 Division of General and Foregut Surgery, Department of Biomedical Sciences for Health, IRCCS Policlinico San Donato, Anesthesiology and Intensive Care Unit, University of Milan, Milan, MI, Italy.