[1] Manchester Univ Hosp NHS Fdn Trust, Manchester Royal Infirm, Manchester Acad Hlth Sci Ctr, Dept Anaesthesia & Intens Care, Oxford Rd, Manchester M13 9WL, Lancs, England
[2] Univ Manchester, Cardiovasc Metab & Nutr Sci, Oxford Rd, Manchester M13 9PL, Lancs, England
[3] Manchester Univ Hosp NHS Fdn Trust, Manchester Royal Infirm, Manchester Acad Hlth Sci Ctr, Dept Oesophago Gastr Surg, Oxford Rd, Manchester M13 9WL, Lancs, England
[4] Fac Biol Med & Hlth, Sch Med Sci, Div Canc Sci, Oxford Rd, Manchester M13 9PL, Lancs, England