[1] Univ Birmingham, Inst Immunol & Immunotherapy, Sch Med, Birmingham, W Midlands, England
[2] Queen Elizabeth Hosp, Dept Diabet, Birmingham, W Midlands, England
[3] Univ Exeter, Sch Med, Exeter EX2 5DW, Devon, England
[4] Taunton & Somerset NHS Fdn Trust, Dept Diabet, Taunton, Somerset, England