1. From the Department of Neurology (Y.H., M.A.W., J.E.A.W., S.M.P., E.S., S.L.C.), Department of Ophthalmology and Visual Sciences (J.E.A.W.), Department of Radiology (T.R., K.L.S.), University of Utah; and George E. Wahlen Veterans Affairs Medical Center (S.L.C.), Salt Lake City, UT.