1. From the Departments of Medicine (M.E.L., D.M.D.), Pediatrics (M.E.L., J.V.T.), Radiology (B.C.Y.), and Surgery (M.R.J.), Massachusetts General Hospital, and the Departments of Medicine (M.E.L., D.M.D., M.R.J.), Pediatrics (M.E.L., J.V.T.), and Radiology (B.C.Y.), Harvard Medical School — both in Boston.