*Department of Surgery, Cancer Center Amsterdam, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands

†HPB-Unit, Department of Upper GI diseases, Karolinska University Hospital, Stockholm, Sweden

‡Department of Surgery in Linköping, and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden

§Pancreatic Surgical Unit, Pederzoli Hospital, Peschiera del Garda, Verona, Italy

∥Pancreatic Surgery Unit, Humanitas Clinical and Research Center—IRCCS and Humanitas University Department of Biomedical Sciences, Rozzano, Pieve Emanuele, Milan, Italy

¶Department of HPB and Liver Transplant Surgery, Queen Elizabeth Hospital, University Hospitals of Birmingham NHS Trust, Birmingham, UK

#Department of General Surgery, Medical School, University of Cyprus, Nicosia, Cyprus

**Department of HPB and Transplant Surgery, St. Vincent’s University Hospital, Dublin, Ireland

††Department of Visceral, Transplant and Thoracic Surgery, Medical University of Innsbruck, Innsbruck, Austria

‡‡Department of Hepato-Pancreato-Biliary Surgery, Oslo University Hospital, Oslo, Norway

§§General and Pancreatic Surgery Department, Pancreas Institute, University and Hospital Trust of Verona, Verona, Italy

∥∥Department of Surgery, University of Salamanca/HospitalUniversitario de Salamanca, Salamanca, Spain

¶¶Department of Surgery, Central Military Hospital Prague, Prague, Czech Republic

##Department of Hepatopancreatobiliary and Transplant surgery, Hospital Vall d’Hebrón, Barcelona, Spain

***Department of Pathology, Hospital Clínico Universitario ‘‘Virgen de la Arrixaca,’’ Murcia, Spain

†††Department of Digestive Surgery, Clinical center of Serbia, Faculty of Medicine, University of Belgrade, Belgrade, Serbia

‡‡‡Department of Surgery, Hospital Cli´nico Universitario ‘‘Virgen de la Arrixaca,’’Murcia, Spain

§§§ISS Aragón, Department of Surgery, Miguel Servet University Hospital, Zaragoza, Spain

∥∥∥Department of Surgery, Salzkammergut Klinikum, Vöcklabruck, Austria

¶¶¶Department of Abdominal Surgery, University Medical Centre Ljubljana, Ljubljana, Slovenia

###Department of Surgery, Paracelsus Medical University, Salzburg, Austria

****Department of Surgery, Koc University, Istanbul, Turkey

††††Department of Visceral, Vascular, and Endocrine Surgery, Martin Luther University, Halle-Wittenberg, Germany

‡‡‡‡Department of Digestive Surgery & Liver Transplantation, Croix Rousse University Hospital, Hospices Civils de Lyon, University of Lyon I, Lyon, France

§§§§Department of General and Digestive Surgery, University Hospital of Guadalajara, Guadalajara, Spain

Marc G. Besselink and Jose M. Ramia-Angel are senior author.

Collaborators: M. Abu Hilal, M.D., Ph.D. (Department of Surgery, Southampton University Hospital,Southamptom, UK);M.Bekheit,M.Sc.,Ph.D.,F.R.C.S. (Department of Surgery, Aberdeen Royal Infirmary, Aberdeen, UK); C. Bertrand, M.D. (Department of Surgery, CHU UCL Namur—Godinne, Yvoir, Belgium), A. Calvo, M.D.,Ph.D. (DepartmentofSurgery, PuertoRealUniversityHospital, Puerto Real, Spain); M. Garces-Albir, M.D., Ph.D. (Department of Surgery, Liver, Biliary and Pancreatic Unit, Hospital Clinico, University of Valencia, Biomedical Research

Institute (INCLIVA), Valencia, Spain), O. Ginghina, M.D., PhD (Department of Surgical Oncology, Saint John Emergency Hospital, Bucharest, Romania), M.A. Gomez Bravo (Department of Hepato Biliary Pancreato and Transplant Surgery, Unversitary Virgen del Rocio Hospital, Sevilla, Spain), M. Jesus Castro, M.D. (HPB Unit, Hospital Universitario Puerta del Mar, Cadiz, Spain), R. Jorba, M.D. (Department of General and Digestive Surgery, Hospital Universitari Joan XXIII de Tarragona, Tarragona, Spain), D. Lopez Guerra, Ph.D. (Department of Hepatobiliary and Liver Transplant Surgery, Hospital Infanta Cristina, Badajoz, Spain), N. Machairas, M.D., Ph.D. (3rd Department of Surgery, National and Kapodistrian University of Athens, Medical School, Athens, Greece), V.E. deMeijer, M.D., Ph.D. (Department of Surgery, University of Groningen and University Medical Center Groningen, Groningen, the Netherlands), R. Miller, M.D. (General Surgery Department, Kaplan Medical Center, Rehovot, Israel), I. Negoi, M.D., Ph.D. (Departmentof General Surgery, Emergency Hospital of Bucharest, Bucharest, Romania), V.B. Nieuwenhuijs, M.D., Ph.D. (Department of Surgery, Isala, Zwolle, the Netherlands), I. Passas, M.D. (Department of Surgical Oncology and HPB Surgery, Metropolitan Hospital, Athens, Greece), B. Perez-Saborido, M.D., Ph.D. (Department of General and Digestive Surgery, Rio Hortega University Hospital, Valladolid, Spain), M. Prieto, M.D. (Hepatobiliary Surgery and Liver Transplant Unit, Cruces University Hospital, Bilbao, Spain), M. Rodriguez-Lopez, M.D., Ph.D. (Department of General and Digestive Surgery, Valladolid University Clinic Hospital, Valladolid, Spain), G. Roeyen, M.D., Ph.D. (Department of Hepatobiliary, Endocrine and Transplantation Surgery, Antwerp University Hospital, Antwerp, Belgium), J. Salinas, M.D., Ph.D. (Department of General and Digestive Surgery, Hospital Universitario la Paz, Madrid, Spain), A.L. Segreto, M.D. (Department of General Surgery, Hospital SS Antonio, Biagio and Cesare Arrigo, Alessandria, Italy), I. Sideris (Department of Surgical Oncology and HPB Surgery, Metropolitan Hospital, Athens, Greece), M.A. Suarez-Murioz, M.D., PhD. (General & Digestive Surgery Service, University Hospital Virgen de la Victoria, Malaga, Spain), A. Suhool (Department of Surgery, Southampton University Hospital, Southamptom, UK), F. J. Tejero-Pintor, M.D., Ph.D. (Department of General and Digestive Surgery, Rio Hortega University Hospital, Valladolid, Spain), C. Toso, M.D. (Department of Surgery, Geneva University Hospitals, Geneva, Switzerland)

Study design: A.L., L.S., M.E., J.K., M.L., M.B., J.R.A.; data acquisition: all coauthors; manuscript writing: A.L., L.S., M.B., J.R.A.; data analysis and interpretation: all coauthors; manuscript revising: all coauthors; final approval: all coauthors.

The authors report no conflicts of interest.

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