[1] Univ Oxford, Diabet Trials Unit, Oxford, England
[2] Oxford Univ Hosp Natl Hlth Serv Fdn Trust, Oxford Ctr Diabet Endocrinol & Metab, Oxford, England
[3] Univ Warwick, Diabet Trials Unit, Warwick, England
[4] Queen Mary Univ London, Wolfson Inst Populat Hlth, London, England