1. Department of Clinical Sciences, Section of Gastroenterology and Hepatology, Skåne University Hospital, Entrance 35, 205 02 Malmö, Lund University, Sweden.
2. Department of Clinical Sciences, Section of Pathology, Skåne University Hospital, Entrance 78, 205 02 Malmö, Lund University, Sweden.
3. Department of Clinical Sciences, Section of Surgery, Skåne University Hospital, Entrance 42, 205 02 Malmö, Lund University, Sweden.