1 From the Department of Neurosurgery (M.I.H.C., A.S.L., L.F.G., E.F.H., A.R.Z.) and Division of Interventional Radiology, Department of Radiology (T.P.S.), Duke University Hospitals, Durham, NC. maryih.cobb@duke.edu.
2 From the Department of Neurosurgery (M.I.H.C., A.S.L., L.F.G., E.F.H., A.R.Z.) and Division of Interventional Radiology, Department of Radiology (T.P.S.), Duke University Hospitals, Durham, NC.