1. From the Department of Neurology (E.L.B., D.L.S., D.L., J.A.K., L.C.S.), Advanced Imaging Research Center (E.L.B., D.L.S., W.R.), Department of Radiology (J.P.), and Department of Anesthesiology and Perioperative Medicine (J.J.I.), Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239-3098.