[1] Emory Univ, Sch Med, Dept Neurol, Atlanta, GA 30322 USA
[2] Univ Crete, Sch Med, Dept Neurol, Iraklion, Greece
[3] Highland Hosp, Dept Neurol, San Francisco, CA USA
[4] Northwestern Univ, Dept Neurol, Chicago, IL USA
[5] Johns Hopkins Univ, Dept Neurol, Baltimore, MD USA
[6] Washington Univ, Sch Med, Dept Neurol Surg, St Louis, MO USA