[1] Harvard Med Sch, 25 Shattuck St, Boston, MA 02115 USA
[2] Imperial Coll London, Sch Publ Hlth, Dept Epidemiol & Biostat, London, England
[3] Imperial Coll London, Dept Med, Ctr Pharmacol & Therapeut, London, England
[4] Novo Nordisk Res Ctr, Oxford, England
[5] St Georges Univ London, Inst Med & Biomed Educ, Clin Pharmacol & Therapeut Sect, London, England
[6] St Georges Univ London, Inst Infect & Immun, London, England
[7] St Georges Univ Hosp NHS Fdn Trust, Clin Pharmacol Grp, Pharm & Med, London, England