1. Thyroid Division, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School (A.C.B., M.J.B., P.R.L.), Boston, Massachusetts 02115
2. Dipartimento di Endocrinologia ed Oncologia Molecolare e Clinica, Universita’ Federico II (D.S.), 80131 Naples, Italy
3. Institute of Experimental Medicine, Hungarian Academy of Sciences (B.G.), Budapest, H-1083 Hungary