1. Department of Radiology (M.A.B., M.T.), Boston, Massachusetts 02114
2. Neuroendocrine Unit (A.V.G., E.L., M.G.L., K.K.M.), Boston, Massachusetts 02114
3. Biostatistics Center (D.A.S.), Boston, Massachusetts 02114
4. Cardiology Division (L.C.H.), Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114