1. From the Department of Radiology (A.G., K.K., H.B., E.E.M., P.C.S.), Brain and Mind Research Institute (A.G., H.K.), Department of Neurology (H.K.), Department of Healthcare Policy and Research (A.P., A.E.G., P.C.S., A.I.M.), and Samuel J. Wood Library and C.V. Starr Biomedical Information Center (D.W., K.J.P.), Weill Cornell Medical College, New York, NY; and Stroke Screening and Monitoring Division, AtheroPoint LLC, Roseville, CA (J.S.S.).