1. From the Departments of Neurology (M.P.S., J.M.M.-T., M.L.M., C.J.K., P.J.D., P.J.B.D.), Laboratory Medicine and Pathology (R.L.K., W.R.M.), Hematology (T.M.H., P.B.J., I.N.M., A.K.), Radiology (K.A.), Neurosurgery (R.J.S.), and Quantitative Health Sciences (J.M.), Mayo Clinic, Rochester, MN; and Neurological Institute of Thailand (N.S.), Bangkok.