Departments of Gastrointestinal Surgery and Gastroenterology, Vestfold Hospital, Tonsberg, Norway
2.Department of Cellular Physiology and Metabolism, Faculty of Medicine, University of Geneva, Anatomy Sector, Geneva, Switzerland
3.Department of Digestive Surgery, Akershus University Hospital, University of Oslo, Oslo, Norway
4.Departments of Gastrointestinal Surgery and Gastroenterology, Vestfold Hospital, Tonsberg, Norway; Department of Digestive Surgery, Akershus University Hospital, University of Oslo, Oslo, Norway