[1] Univ Birmingham, Inst Metab & Syst Res, Birmingham, W Midlands, England
[2] Univ Birmingham, Ctr Endocrinol Diabet & Metab, Birmingham Hlth Partners, Birmingham, W Midlands, England
[3] Univ Birmingham, Birmingham Biomed Res Ctr, Womens Metab Hlth Theme, Birmingham, W Midlands, England
[4] Birmingham Womens & Childrens NHS Fdn Trust, Dept Endocrinol & Diabet, Birmingham, W Midlands, England
[5] Med Res Council Lab Med Sci, London, England
[6] Imperial Coll London, Inst Clin Sci, London, England