1. From the Department of Medicine, Brigham and Women’s Hospital (N.H.), the Departments of Medicine (N.H., E.W.L.), Radiology (R.S.D.), Pediatrics (A.E.L.), and Pathology (J.M.), Harvard Medical School, and the Departments of Medicine (E.W.L.), Radiology (R.S.D.), Pediatrics (A.E.L.), and Pathology (J.M.), Massachusetts General Hospital — all in Boston.