University of Amsterdam, Amsterdam Medical Center, Department of Surgery, University of Amsterdam, Amsterdam Medical Center, Department of Surgery, University of Amsterdam - Department of Oncology, Netherlands Cancer Institute - Department of Pathology, University of Amsterdam - Department of Radiation Oncology, Netherlands Cancer Institute, Erasmus University Rotterdam (EUR) - Department of Surgery, Radboud University Nijmegen - Radboud University Medical Center, Catharina Hospital, Bravis Hospital, Maasziekenhuis Pantein, Onze Lieve Vrouwen Gasthuis, Utrecht University - University Medical Center (Utrecht), University of Groningen - University Medical Center Groningen (UMCG), Catharina Hospital, Netherlands Cancer Institute, University of Amsterdam, Amsterdam Medical Center, Department of Surgery, Bernhoven, Free University, Amsterdam, Flevo Hospital, Isala Hospital, St. Antonius Hospital, Elisabeth-Tweesteden Hospital, Amstelland Hospital, University of Amsterdam - Department of Clinical Epidemiology, Biostatistics and Bioinformation, University of Amsterdam, Amsterdam Medical Center, Department of Surgery and Independent