1. From the Department of Neurosurgery and Stanford Stroke Center (M.M.D., A.S.D., A.A., A.-L.M., R.B., K.J., G.S., G.K.S.), Stanford University School of Medicine, Stanford, Calif; and Department of Radiology and Molecular Imaging Program (Z.L., J.C.W.), Stanford University School of Medicine, Stanford, Calif.