1. Department of Internal Medicine, Division of Gastroenterology, Örebro University Hospital, SE 70116 Örebro, Sweden
2. Department of Gastroenterology, Faculty of Medicine and Health, Örebro University, SE 70182 Örebro, Sweden
3. Department of Surgery, Faculty of Medicine and Health, Örebro University, SE 70182 Örebro, Sweden
4. University Health Care Research Center, Faculty of Medicine and Health, Örebro University, SE 70182 Örebro, Sweden