1. 1Clinical Effectiveness Research Group, University of Oslo, Oslo, Norway.
2. 2Clinical Effectiveness Research Group, Oslo University Hospital, Oslo, Norway.
3. 3Section of Oncology, Drammen Hospital, Vestre Viken Hospital Trust, Drammen, Norway.
4. 4Department of Epidemiology and Data Science, Amsterdam Public Health Research Group, Amsterdam University Medical Centers, Location VU Medical Center, Amsterdam, the Netherlands.
5. 5Department of Pathology, The Netherlands Cancer Institute, Amsterdam, the Netherlands.
6. 6Department of Pathology, Oslo University Hospital, Oslo, Norway.
7. 7Bioinformatics Group, Department of Computer Science, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.
8. 8Department of Gastrointestinal Oncology, Netherlands Cancer Institute, Amsterdam, the Netherlands.
9. 9Department of Gastroenterology and Hepatology, Leiden University Medical Center, Leiden, the Netherlands.
10. 10Department of Gastroenterology and Hepatology, Amsterdam University Medical Centers, Location Academic Medical Center, Amsterdam, the Netherlands.
11. 11Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center, Rotterdam, the Netherlands.