1Department of Surgery, Leiden University Medical Centre, Leiden, The Netherlands
2Department of Medical Oncology, Leiden University Medical Centre, Leiden, The Netherlands
3Department of Oncology, Oslo University Hospital, Oslo, Norway
4K.G. Jebsen Colorectal Cancer Research Centre, Oslo University Hospital, Oslo, Norway
5Department of Gastrointestinal Surgery, Stavanger University Hospital, Stavanger, Norway
6Department of Clinical Medicine, University of Bergen, Bergen, Norway
7Regional Centre of Excellence of Palliative Care Western Norway, Haukeland University Hospital, Bergen, Norway
8Department of Clinical Epidemiology, Leiden University Medical Centre, Leiden, The Netherlands
9Cancer Registry of Norway, Institute of Population-based Cancer Research, Oslo, Norway