[1] MRC Human Nutr Res, Elsie Widdowson Lab, Cambridge CB1 9NL, England
[2] No Gen Hosp, Ctr Human Nutr, Sheffield S5 7AU, S Yorkshire, England
[3] Univ Sheffield, Sheffield S5 7AU, S Yorkshire, England
[4] Oxford Brookes Univ, Sch Biol & Mol Sci, Oxford OX3 0BP, England