1. Emergency Surgery Unit, Department of Surgical Science, Cagliari University Hospital University of Cagliari, Policlinico Universitario “D. Casula”, Azienda Ospedaliero‐Universitaria di Cagliari SS 554, Km 4,500 09042 Cagliari, Monserrato Italy
2. Hepatobiliary and Pancreatic Surgery Unit Hospital del Mar. Universitat Pompeu Fabra Barcelona Spain