1. Endocrine Research Unit (J.D.V.), Rochester, Minnesota 55905
2. Laboratory Medicine and Pathology (J.D.V., O.P.B., E.W.K., R.J.S., G.G.K.), Mayo Clinic, Rochester, Minnesota 55905
3. Mayo School of Graduate Medical Education Center for Translational Science Activities, Immunochemical Laboratory (R.B.D.), Rochester, Minnesota 55905
4. Departments of Neurology (S.A.T.), Rochester, Minnesota 55905