1. National Institute of Public Health, University of Southern Denmark , Studiestræde 6, Copenhagen DK-1455 , Denmark
2. Department of Clinical Medicine, Aalborg University , Mølleparkvej 4, Aalborg DK-9000 , Denmark
3. Centre for Pancreatic Diseases, Department of Gastroenterology and Hepatology, Aalborg University Hospital , Mølleparkvej 4, Aalborg DK-9000 , Denmark
4. Gastrounit, Hvidovre University Hospital , Kettegaard Alle 30, Hvidovre DK-2650 , Denmark