1 Amsterdam UMC, location University of Amsterdam, Department of Surgery, Amsterdam, The Netherlands.
2 Cancer Center Amsterdam, Amsterdam, The Netherlands.
3 Department of Surgery, Regional Academic Cancer Center Utrecht, University Medical Center Utrecht/St. Antonius Hospital Nieuwegein, Utrecht & Nieuwegein, The Netherlands.
4 Department of Surgery, Maasstad Hospital, Rotterdam, The Netherlands.
5 Amsterdam UMC, location Vrije Universiteit, Department of Surgery, Amsterdam, The Netherlands.
6 Department of Surgery, Erasmus MC Cancer Institute, University Medical Center, Rotterdam, The Netherlands.
7 Department of Surgery, Isala Clinics, Zwolle, The Netherlands.
8 Department of Surgery, Catharina Hospital, Eindhoven, The Netherlands.
9 Department of Surgery, Jeroen Bosch Hospital, 's Hertogenbosch, The Netherlands.
10 Department of Surgery, University Medical Center Groningen, Groningen, The Netherlands.
11 Department of Surgery, Radboud University Medical Center, Nijmegen, The Netherlands.
12 Department of Surgery, Medisch Spectrum Twente, Enschede, The Netherlands.
13 Department of Surgery, Maastricht University Medical Center, Maastricht, The Netherlands.
14 Department of General, Visceral and Transplant Surgery, University Hospital Aachen, Aachen, Germany.
15 Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands.