1. Endocrine Division, Harvard Vanguard Medical Associates, Boston, Massachusetts.
2. Division of Endocrinology, Beth Israel Deaconess Medical Center, Boston, Massachusetts.
3. New Jersey Endocrine and Diabetes Associates, Ridgewood, New Jersey.
4. Division of Endocrinology, Mayo Clinic, Rochester, Minnesota.
5. The Thyroid Unit, North Shore University Hospital, Manhassett, New York.
6. Division of Endocrinology, Mount Sinai Hospital, New York, New York.
7. Division of Endocrinology, ProHealth Care Associates, Lake Success, New York.
8. Keck School of Medicine, University of Southern California, Los Angeles, California.
9. UCSF Medical Center at Mount Zion, San Francisco, California.