[1] Imperial Coll London, Dept Surg & Canc, London, England
[2] North West London NHS Trust, Dept Colorectal Surg, St Marks Hosp, London, England
[3] Imperial Coll London, Sch Publ Hlth, London, England
[4] Poole Gen Hosp, Dept Surg, Poole, Dorset, England
[5] Hampshire Hosp NHS Fdn Trust, Dept Colorectal Surg, Basingstoke, Hants, England
[6] Frimley Pk Hosp, Dept Colorectal Surg, Frimley, England
[7] Bradford Teaching Hosp NHS Fdn Trust, Dept Colorectal Surg, Bradford, W Yorkshire, England
[8] Christie NHS Fdn Trust, Dept Colorectal Surg, Manchester, Lancs, England
[9] Royal Surrey Cty Hosp NHS Trust, Dept Colorectal Surg, Guildford, Surrey, England
[10] Nottingham Univ Hosp NHS Trust, Dept Gastrointestinal Surg, Nottingham, England
[11] Newcastle Upon Tyne Hosp NHS Trust, Dept Colorectal Surg, Freeman Hosp, Newcastle Upon Tyne, Tyne & Wear, England
[12] Oxford Univ Hosp NHS Trust, Churchill Hosp, Dept Colorectal Surg, Oxford, England
[13] Colchester Hosp East Suffolk & North Essex NHS Fd, Dept Colorectal Surg, Colchester, Essex, England
[14] Yeovil Dist Hosp NHS Fdn Trust, Dept Gen Surg, Yeovil, England
[15] Univ Hosp Plymouth NHS Trust, Dept Colorectal Surg, Plymouth, Devon, England