1. From the Departments of Psychiatry (J.B.W.), Radiology (C.P.S., D.I.R., M.S., K.J.D., J.H.T.), Pathology (J.M.B.), and Medicine (T.F.), Massachusetts General Hospital, Fruit St, Boston, MA 02114; and Massachusetts General Physicians Organization, Boston, Mass (J.B.W., C.P.S., H.R., T.F.).