[1] Massachusetts Gen Hosp, Dept Neurol, Boston, MA 02114 USA
[2] Brigham & Womens Hosp, Boston, MA 02115 USA
[3] Harvard Univ, Sch Med, Boston, MA USA
[4] Brigham & Womens Hosp, Dept Neurol, Div Neurol Infect, Boston, MA 02115 USA
[5] Harvard Univ, Sch Med, Boston, MA 02115 USA