1. Cambridge Colorectal Unit, Addenbrooke’s Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, UK
2. West Suffolk Hospital NHS Foundation Trust, Bury St Edmunds IP33 2QZ, UK
3. Division of Digestive Surgery, University Hospitals of Geneva, 1205 Geneva, Switzerland
4. Medical School, University of Geneva, 1206 Geneva, Switzerland