1. Clinical Endocrine Branch (R.M., A.Y.C., B.C.L., A.O.L., E.K.C., P.G.) National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892;
2. Metabolic Research Laboratories (M.A.S., R.K.S.), Institute of Metabolic Science, University of Cambridge, Addenbrooke’s Hospital, Cambridge CB2 0QQ, United Kingdom
3. Kidney Diseases Branch (J.E.B.), National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892;