1. Department of Gastroenterology Queen Elizabeth Hospital and University Hospital Birmingham NHS Foundation Trust, Mindelsohn Way Edgbaston Birmingham, B15 2GW, UK
2. Surgical Research Unit, Odense University Hospital, Svendborg, Denmark
3. Gastroenterology and Endoscopy Unit, University Hospital of Parma, University of Parma, Parma, Italy
4. Department of Surgery, SATC-C, OUH Svendborg Sygehus, Svendborg, Denmark
5. Department of Clinical Research, University of Southern Denmark (SDU), Odense, Denmark
6. Department of Social Medicine and Public Health, Pomeranian Medical University, Szczecin, Poland