1. Departments of Laboratory Medicine and Pathology (K.W.C., D.M., L.A.E., S.K.G.G.), Mayo Clinic, Rochester, Minnesota 55905
2. Department of Endocrinology (A.M.R.), Healtheast Care System, Maplewood, Minnesota 55117
3. Medicine (B.M., S.K.G.G.), Mayo Clinic, Rochester, Minnesota 55905