1. Division of Endocrinology and Metabolism (M.X., S.T., M.E., P.W.L.), Baltimore, Maryland 21287;
2. Department of Medicine, and Departments of Pathology (W.H.W.), Baltimore, Maryland 21287;
3. Otolaryngology-Head and Neck Surgery (R.P.T., Y.C., E.R., J.A.C., D.S.), Baltimore, Maryland 21287;
4. J. B. Pierce Laboratory (K.J.R.), New Haven, Connecticut 06510;
5. Department of Epidemiology (K.A.C.), the Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland 21205;
6. Washington Hospital Center and Medstar Research Institute (V.V.), Washington, D.C. 20010;
7. Hospital for Endocrine Surgery (A.L.), 252000 Kiev, Ukraine;
8. Department of Pathology (G.T., P.H.), New Haven, Connecticut 06510;
9. Department of Pathology (G.T.), University of Bologna School of Medicine, 40126 Bologna, Italy;
10. Section of Endocrinology-Department of Internal Medicine (E.H.H.), Yale University School of Medicine, New Haven, Connecticut 06510;
11. Surgery (C.B.U., A.P.T., M.A.Z.), The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287;
12. Division of Endocrinology and Metabolism (S.B.), The Johns Hopkins Bayview Medical Center, Baltimore, Maryland 21224;
13. Divisions of Endocrinology and Oncology (M.D.R.), The Ohio State University and Arthur G. James Cancer Center, Columbus, Ohio 43210