Univ Fortaleza, Med, Fortaleza, Ceara, Brazil; Brown Univ, Neurol, Providence, RI 02912 USA; Emory Univ, Neurol, Atlanta, GA 30322 USA; Univ Fed Sao Paulo, Neurol, Sao Paulo, Brazil; Massachusetts Gen Hosp, Radiol, Boston, MA 02114 USA; Massachusetts Gen Hosp, Neurol, Boston, MA 02114 USA; NINDS, Bldg 36,Rm 4D04, Bethesda, MD 20892 USA; UCSF, Neurol, San Francisco, CA USA; Univ Fed Sao Paulo, Neurol, Sao Paulo,...