1. Department of Surgery, Radboud University Medical Centre, Nijmegen, the Netherlands
2. Department of Surgery, IJsselland Hospital, Capelle aan de Ijssel, the Netherlands
3. Department of Medical Oncology, Academic Medical Centre, Amsterdam, the Netherlands
4. Department of Pathology, Radboud University Medical Centre, Nijmegen, the Netherlands
5. Department of Radiation Oncology, Erasmus Medical Centre, Rotterdam, the Netherlands
6. Department of Oncology, Erasmus Medical Centre Cancer Institute, Rotterdam, the Netherlands
7. Department of Surgery, Academic Medical Centre, Amsterdam, the Netherlands
8. Department of Surgery, Catharina Hospital, Eindhoven, the Netherlands
9. Department of Surgery, Amphia Hospital, Breda, the Netherlands
10. Department of Surgery, Medical Centre Slotervaart, Amsterdam, the Netherlands
11. Department of Surgery, Laurentius Hospital, Roermond, the Netherlands
12. Department of Surgery, Netherlands Cancer Institute, Amsterdam, the Netherlands
13. Department of Surgery, Medical Centre Leeuwarden, Leeuwarden, the Netherlands
14. Department of Surgical Oncology, Erasmus Medical Centre, Rotterdam, the Netherlands
15. Department of Radiotherapy, Leiden University Medical Centre, Leiden, the Netherlands