1. Departments of Laboratory Medicine and Pathology (C.L.H.S., T.J.S., R.J.S., S.K.G.G.), Mayo Clinic, Rochester, Minnesota 55905
2. Department of Surgery, Division of Surgical Oncology and Endocrine Surgery (E.P.C.), Vanderbilt-Ingram Cancer Center, Nashville, Tennessee 37232
3. Departments of Diagnostic Radiology (C.C.R.), Mayo Clinic, Rochester, Minnesota 55905
4. Departments of ackson Thyroid and Endocrine Clinic, P.L.L.C. (J.W.S.), Jackson, Mississippi 39216
5. Departments of Medicine, Division of Endocrinology (S.K.G.G.), Mayo Clinic, Rochester, Minnesota 55905