1. From the Warren Alpert Medical School (M.K.), Brown University, Providence, RI; Department of Radiology and Biomedical Imaging (M.K., A.M.), Yale University, New Haven, CT; National Institute of Neurological Disorders and Stroke (H.C.), NIH, Bethesda, MD; Division of Interventional Neuroradiology (H.C., M.C., D.G.), Department of Radiology, University of Maryland Medical Center, Baltimore; Department of Neurology (H.C.), Georgetown University Hospital, Washington, DC; and Department of Neurology (S...