1. Departments of Clinical Biochemistry (R.K.S., M.A.S., J.C.W., S.O.), Cambridge CB2 2QQ, United Kingdom
2. Medical Research Council Epidemiology Unit (J.L., N.J.W.), Institute of Public Health, University of Cambridge, Elsie Widdowson Laboratory, Cambridge CB1 9NL, United Kingdom
3. Medicine (C.S.M., M.G., V.K.K.C.), University of Cambridge, Addenbrooke’s Hospital, Cambridge CB2 2QQ, United Kingdom
4. Clinical Endocrinology Branch (E.K.C., P.G.), National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892