1. Section of Endocrinology, Diabetes, and Nutrition (E.N.P., A.M.L., X.H., S.P., L.E.B.), Boston Medical Center and Boston University School of Medicine, Boston, Massachusetts 02118
2. Division of Laboratory Sciences (B.C.B., L.V.-B.), National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia 30333
3. Department of Medicine (H.R.B.), Golestan University Medical School, Golestan, Islamic Republic of Iran