[1] Basingstoke & N Hampshire Hosp, Basingstoke RG24 9NA, Hants, England
[2] Cty Durham & Darlington Fdn Trust, Dept Gastroenterol, Darlington, Durham, England
[3] Royal Victoria Hosp, Peptide Lab, Belfast BT12 6BA, Antrim, North Ireland
[4] Univ Sheffield, Dept Clin Pharmacol, Sheffield, S Yorkshire, England
[5] Southampton Gen Hosp, Dept Radiol, Southampton SO9 4XY, Hants, England
[6] UCL, Dept Gastroenterol, London, England
[7] Cambridge Univ Hosp NHS Fdn Trust, Addenbrookes Hosp, Dept Oncol, Cambridge, England
[8] Royal Free Hosp, Dept Cardiol, London NW3 2QG, England
[9] Univ Hosp Morecambe Bay Fdn Trust, Dept Gastroenterol, Barrow In Furness, Cumbria, England
[10] Kings Coll London, London WC2R 2LS, England
[11] UCL, Dept Oncol, London, England
[12] Univ Sheffield, Dept Endocrinol, Sheffield, S Yorkshire, England
[13] Univ Liverpool, Dept Surg, Liverpool L69 3BX, Merseyside, England
[14] Beatson Ctr, Dept Oncol, Glasgow, Lanark, Scotland
[15] Queen Marys Univ, Dept Radiol, London, England
[16] Univ Leicester, Dept Oncol, Leicester, Leics, England
[17] Univ Oxford, Acad Dept Endocrinol Diabet & Metab, Oxford, England
[18] Royal Free Hosp, Dept Gastroenterol, London NW3 2QG, England
[19] Christie Hosp NHS Fdn Trust, Dept Med Oncol, Manchester, Lancs, England
[20] St James Univ Hosp, Dept Histopathol, Leeds, W Yorkshire, England