1. Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
2. Department of Surgery, Karolinska University Hospital, Stockholm, Sweden
3. Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands
4. Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, Leiden, The Netherlands
5. Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
6. Department of medical oncology, Biomedical Research Institute Incliva, University of Valencia, Valencia, Spain
7. Department of Surgery, Amphia Hospital, Breda, The Netherlands
8. Department of Medical Oncology, Northwest Clinics, Alkmaar, The Netherlands
9. Department of Medical Oncology, Vall Hebron Institute of Oncology (VHIO), Vall Hebron University Hospital, Autonomous University of Barcelona (UAB), Barcelona, Spain
10. Department of surgical oncology, Institute of Oncology Ljubljana, Ljubljana, Slovenia
11. Department of Radiation Oncology, Netherlands Cancer Institute, Amsterdam, The Netherlands
12. Department of Radiation Oncology, Leiden University Medical Center, Leiden, The Netherlands
13. Department of Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands