1. Division of Pancreatic Surgery, Pancreas Translational and Clinical Research Centre, Vita-Salute San Raffaele University, Istituto di Ricovero e Cura a Carattere Scientifico San Raffaele Scientific Institute, Milan, Italy
2. General and Pancreatic Surgery Unit — Pancreas Institute, University of Verona, Verona, Italy
3. University Centre for Statistics in the Biomedical Sciences, Vita-Salute San Raffaele University, Milan, Italy