1. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Stockholm Sweden
2. Department of Transplantation Medicine Clinical Effectiveness Research Group Oslo University Hospital Oslo Norway
3. Clinical Effectiveness Research Group Institute of Health and Society University of Oslo Oslo Norway
4. Department of Transplantation Medicine Norwegian PSC Research Center Division of Surgery, Inflammatory Diseases and Transplantation Oslo University Hospital Rikshospitalet Oslo Norway
5. Section of Gastroenterology Department of Transplantation Medicine Division of Surgery, Inflammatory Medicine and Transplantation Oslo University Hospital Rikshospitalet Oslo Norway
6. Department of Gastroenterology, Hepatology and Clinical Oncology Centre of Postgraduate Medical Education Warsaw Poland
7. Research Institute of Internal Medicine Division of Surgery, Inflammatory Diseases and Transplantation Oslo University Hospital Oslo Norway
8. Institute of Clinical Medicine Faculty of Medicine University of Oslo Oslo Norway
9. Hybrid Technology Hub‐Centre of Excellence Institute of Basic Medical Sciences Faculty of Medicine University of Oslo Oslo Norway
10. Department of Clinical Science and Education Södersjukhuset Karolinska Institutet Stockholm Sweden
11. Department of Epidemiology and Health Statistics & Key Laboratory of Ministry of Education for Gastrointestinal Cancer Fujian Medical University Fuzhou China