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Department of Laboratory Medicine and Pathology (B.C.N., S.K.G.G., A.A.-S.), Division
of Endocrinology, Metabolism, and Nutrition (S.K.G.G., B.G.C.L., M.R.C., A.F.T.),
Mayo Clinic, Rochester, Minnesota 55905; Queen Elizabeth Hospital Birmingham (P.M.C.),
Birmingham B15 2TH, United Kingdom; Department of Laboratory Medicine (A.N.H.), University
of Washington, Seattle, Washington 98108; and University of Southern California (C.A.S.),
Los Angeles, California 90089.