[1] Wrexham Maelor Hosp, Core Surg Trainee Wales Deanery, Wrexham, Wales
[2] Abertawe Bro Morgannwg Univ Hlth Board, Singleton Hosp, Colorectal Dept, Baglan, Wales
[3] Imperial Coll London, St Marys Hosp, Dept Surg & Canc, London, England
[4] Swansea Univ, Coll Med, Med Microbiol & Infect Dis, Swansea, W Glam, Wales