1. Department of MedicineSorlandet HospitalKristiansandNorway
2. Department of Transplantation MedicineSection of GastroenterologyOslo University HospitalNorway
3. Department of Health Economy and Health Management and KG Jebsen Center of Colorectal Cancer ResearchUniversity of OsloNorway
4. Department of MedicineSorlandet HospitalArendalNorway
5. Telemark HospitalSkienNorway
6. Harvard T. H. Chan School of Public HealthBostonMAUSA
7. Department of Medical Epidemiology and BiostatisticsKarolinska InstitutetStockholmSweden