1. Division of Gastroenterology, Department of Medicine, County Hospital Ryhov, Jönköping
2. Division of Gastroenterology, Department of Medicine, Örebro University Hospital, Örebro
3. School of Health and Medical Sciences, Örebro University, Örebro
4. Division of Gastroenterology and Hepatology, Department of Clinical and Experimental Medicine, Linköping University Hospital, Linköping, Sweden