Affiliation: | 1. Department of Gastrointestinal Surgery, Stavanger University Hospital, Stavanger, Norway;2. Department of Clinical Medicine, University of Bergen, Bergen, Norway;3. Department of Pathology, Stavanger University Hospital, Stavanger, Norway;4. Department of Research, Stavanger University Hospital, Stavanger, Norway;5. Department of Mathematics and Natural Sciences, University of Stavanger, Stavanger, Norway |