Mattias Soop1, Laura Hancock2, Justin Davies3. 1. Ersta IBD Centre, Ersta Hospital, Karolinska Institutet at Danderyd Hospital, Stockholm, Sweden. 2. Department of Colorectal Surgery, Manchester University NHS Foundation Trust (Wythenshawe), Manchester, UK. 3. Cambridge Colorectal Unit, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK.