Aleidis S Brandrud1,2, Michael Bretthauer3,4, Guttorm Brattebø5,6, May Jb Pedersen7, Kent Håpnes8, Karin Møller9, Trond Bjorge10, Bjørnar Nyen11, Lars Strauman12, Ada Schreiner13, Gro S Haldorsen14, Maria Bergli1, Eugene Nelson15, Tamara S Morgan15, Per Hjortdahl16. 1. Quality Department, Vestre Viken HF, Drammen, Buskerud, Norway. 2. Institute of Health and Society, Faculty of Medicine, University of Oslo, Oslo, Norway. 3. Clinical Effectiveness Research Group, Institute of Health and Society, University of Oslo, Oslo, Norway. 4. Department of Transplantation Medicine and K G Jebsen Center for Colorectal Cancer Research, Oslo University Hospital, Oslo, Norway. 5. Norwegian National Advisory Unit on Trauma, Division of Emergencies and Critical Care, Oslo University Hospital, Oslo, Norway. 6. Department of Anaesthesia & Intensive Care, Haukeland University Hospital, Bergen, Norway. 7. Department of General and Orthopedic Surgery, Obstetrics, Anaesthesia and Intensive Care, Ringerike Hospital, Vestre Viken HF, Drammen, Buskerud, Norway. 8. Division of Mental Health and Addiction, Ringerike DPS, Vestre Viken HF, Drammen, Buskerud, Norway. 9. Department of Medicine, Municipality of Ringerike, Honefoss, Buskerud, Norway. 10. Department of Pulmonary Diseases, Ostfold Hospital, Kalnes, Ostfold, Norway. 11. Department of Medicine, Municipality of Porsgrunn, Porsgrunn, Norway. 12. Department of Medicine, Nordland Hospital, Lofoten, Nordland, Norway. 13. Norwegian Federation of Organizations of Disabled People, Oslo, Norway. 14. Department of Quality, Medicine and Patient Safety, South-Eastern Norway Regional Health Authority, Hamar, Norway. 15. The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire, USA. 16. Department of Family Medicine, Faculty of Medicine, Institute of Health and Society, University of Oslo, Oslo, Norway.