Affiliation: | 1. Department of Health Studies, University of Stavanger and Research Department, Stavanger University Hospital, , Stavanger, Norway;2. Department of Education and Sports Science, University of Stavanger, , Stavanger, Norway;3. Department of Surgery/Division of Gastroenterological Surgery, Stavanger University Hospital, , Stavanger, Norway;4. Department of Surgery, University of Bergen, , Bergen, Norway;5. Department of Educational Psychology, University of Stavanger, , Stavanger, Norway |