1. From the Departments of Surgery (D.R.K., H.M.A.K.), Anesthesia (J.C.C.), and Radiology (N.E.F.), Massachusetts General Hospital, and the Departments of Surgery (D.R.K., H.M.A.K.), Anesthesia (J.C.C.), and Radiology (N.E.F.), Harvard Medical School — both in Boston.