1. School of Psychology (S.L.R., C.A.J., L.F., K.S., J.B.), Birmingham B15 2TH, United Kingdom
2. Centre for Endocrinology, Diabetes, and Metabolism (B.A.H., P.M.S., C.H.L.S., N.P.K., J.W.T.), Institute of Biomedical Research, School of Clinical and Experimental Medicine, University of Birmingham, Edgbaston, Birmingham B15 2TH, United Kingdom
3. Department of Clinical Biochemistry (N.T.), King's College Hospital National Health Service Foundation Trust, London WC2R 2LS, United Kingdom
4. Children's Hospital, Oakland's Research Institute (C.H.L.S.), Oakland, California 94609