1. Department of Surgical Oncology, Netherlands Cancer Institute, Amsterdam, Netherlands
2. Department of Surgery, University of Groningen, Groningen, Netherlands
3. Department of Surgery, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
4. Department of Surgery, Radboud University Medical Centre, Nijmegen, Netherlands
5. Department of Surgery, University Medical Centre Utrecht, Utrecht, Netherlands
6. Department of Radiation Oncology, Leiden University Medical Centre, Leiden, Netherlands
7. Department of Radiation Oncology, Maastro Clinic, Maastricht, Netherlands
8. Department of Surgery, Catharina Hospital, Eindhoven, Netherlands