1. Department of Gastroenterology, Skåne University Hospital, Lund University, Malmö, Sweden
2. Department of Pediatrics, Skåne University Hospital, Lund University, Malmö, Sweden
3. Department of Surgery, Skåne University Hospital, Lund University, Malmö, Sweden
4. Endoscopy Unit, Department of Gastroenterology, Skåne University Hospital, Lund University, Getg, 40, S-205 02 Malmö, Sweden