1. Thyroid Division, Department of Medicine, Brigham and Womens Hospital and Harvard Medical School (H.M.T., S-W.K., D.S., T.B., P.R.L.), Boston, Massachusetts 02111
2. Tupper Research Institute and Department of Medicine, Division of Endocrinology, Diabetes, Metabolism and Molecular Medicine (G.L., R.M.L.), New England Medical Center
3. Department of Neuroscience, Tufts University School of Medicine (R.M.L.), Boston, Massachusetts 02111