1. From the Departments of Medicine (M.A.M., E.Y., A.M.J.), Radiology (S.P.R.), Neurology (A.B.S.), Obstetrics and Gynecology (C.A.C.), and Pathology (S.N.U.), Massachusetts General Hospital, and the Departments of Medicine (M.A.M., E.Y., A.M.J.), Radiology (S.P.R.), Neurology (A.B.S.), Obstetrics and Gynecology (C.A.C.), and Pathology (S.N.U.), Harvard Medical School — both in Boston.