1. Gastro Unit, Division of Endoscopy, Copenhagen University Hospital, Herlev, Denmark
2. Department of Pathology, Copenhagen University Hospital, Rigshospitalet, Denmark
3. Gastro Unit, Division of Surgery, Copenhagen University Hospital, Hvidovre, Denmark
4. Department of Pathology, Copenhagen University Hospital, Herlev, Denmark
5. Department of Gastrointestinal Surgery, Copenhagen University Hospital, Rigshospitalet, Denmark