Colorectal Unit, Addenbrooke's Hospital, Cambridge NHS Foundation Trust, Cambridge, UK. jeremy.meyer@hcuge.ch. Division of Digestive Surgery, University Hospitals of Geneva, Geneva, Switzerland. jeremy.meyer@hcuge.ch. Medical School, University of Geneva, Geneva, Switzerland. jeremy.meyer@hcuge.ch. University of Perugia, Perugia, Italy. Hospital of San Benedetto del Tronto, Marche, Italy. Division of Digestive Surgery, University Hospitals of Geneva, Geneva, Switzerland. Medical School, University of Geneva, Geneva, Switzerland. Colorectal Unit, Addenbrooke's Hospital, Cambridge NHS Foundation Trust, Cambridge, UK.