[1] Royal Devon Univ HealthCare NHS Fdn Trust, Dept Colorectal Surg, Barrack Rd, Exeter EX2 5DW, England
[2] St Marks Natl Bowel Hosp, Dept Colorectal Surg, London, England
[3] Acad Inst, London, England
[4] UCL, Inst Clin Trials & Methodol, London, England
[5] Univ Leicester, Coll Life Sci, Dept Cardiovasc Sci, Biomed Res Unit Cardiovasc Med, Leicester, England
[6] Univ Leicester, Natl Inst Hlth Res, Coll Life Sci, Biomed Res Unit Cardiovasc Med, Leicester, England
[7] Univ Melbourne, Fac Med Dent & Hlth Sci, Dept Crit Care, Melbourne, Vic, Australia
[8] UCL, Div Surg, London, England
[9] Univ Western Australia, Fac Hlth & Med Sci, Perth, WA, Australia