Department of Surgery;
Haraldsplass Deaconess Hospital;
Bergen N-5892;
Norway;
Digestive Disease Institute;
Cleveland Clinic;
Cleveland;
OH 44101;
United States;
Department of General Surgery;
Cleveland Clinic;
Cleveland;
OH 44101;
United States;
Department of Internal Medicine;
University of Bergen;
Bergen 5021;
Norway;
Department of Pathology;
Haukeland University Hospital;
Bergen 5021;
Norway;
Department of Microbiology;
Haukeland University Hospital;
Bergen 5021;
Norway;
Center for Clinical Research;
Haukeland University Hospital;
Bergen 5021;
Norway;
Department of Public Health and Primary Care;
University of Bergen;
Bergen 5021;
Norway;