1 Hepato Pancreato Biliary Unit, Hospital del Mar, Pompeu Fabra University, Barcelona, Spain.
2 Department of Surgical Science, University of Cagliari, Policlinico Universitario "D. Casula", Azienda Ospedaliero-Universitaria Di Cagliari, Cagliari, Italy.
3 Vall d'Hebron University Hospital, Universitat Autonoma de Barcelona UAB, Barcelona, Spain.
4 General Surgery Department, Hospital Universitario Rio Hortega, Valladolid, Spain.
5 Instituto de Validación de la Eficiencia Clinica (IVEC), fundación de HM Hospitales, Madrid, Spain.
6 General Surgery Department, Hospital Universitario Virgen Macarena, Seville, Spain.
7 General Surgery Department, Hospital Universitario Dr Negrin, Universidad de Las Palmas de Gran Canaria, Gran Canaria, Spain.
8 General Surgery Department, Sanchinarro University Hospital, HM Hospitals Faculty of Health Sciences Camilo José Cela University, Madrid, Spain.
9 Department of General Surgery, Dr. Josep Trueta University Hospital, Girona, Spain.
10 Hepato Pancreato Biliary Unit, Department of General Surgery, Joan XXIII University Hospital, Universitat Rovira I Virgili, Tarragona, Spain.
11 Hepato Pancreato Biliary Unit, Department of General Surgery, Segovia University Hospital, Segovia, Spain.
12 Department of Surgery Hospital Clinic, HPB and Liver Transplantation, Barcelona IDIBAPS, Universitat de Barcelona, Barcelona, Spain.
13 Department of General Surgery, La Paz University Hospital, Madrid, Spain.
14 General Surgery, Hospital El Pilar, Barcelona, Spain.
15 General Surgery Department, University Hospital, Instituto de Investigación Clinica Galicia Sur, Vigo, Spain.
16 Department of General Surgery, Alcorcón Foundation University Hospital, Alcorcon, Spain.
17 General Surgery Department, Navarra University Hospital, Pamplona, Spain.
18 Hepato Pancreato Biliary Unit, Hospital del Mar, Pompeu Fabra University, Barcelona, Spain. Ielpo.b@gmail.com.