[1] Massachusetts Gen Hosp, Dept Neurol, Boston, MA 02114 USA
[2] Loyola Univ Chicago, Dept Neurol, Maywood, IL USA
[3] Columbia Univ Coll Phys & Surg, Dept Neurol, New York, NY 10032 USA
[4] Columbia Univ, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY USA
[5] Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA
[6] Univ Calif San Francisco, Dept Pediat, San Francisco, CA 94143 USA
[7] Med Univ S Carolina, Div Emergency Med, Charleston, SC USA
[8] Med Univ S Carolina, Dept Neurosci, Charleston, SC USA
[9] Baltimore Vet Adm Med Ctr, Dept Neurol, Baltimore, MD USA
[10] Univ Maryland, Sch Med, Baltimore, MD 21201 USA
[11] Univ Michigan, Dept Internal Med, Ann Arbor, MI 48109 USA
[12] Univ Michigan, Dept Neurol, Ann Arbor, MI USA
[13] Ann Arbor VA Med Ctr, Ann Arbor, MI USA
[14] SUNY Downstate Coll Med & Med Ctr, Dept Neurol, Brooklyn, NY USA
[15] SUNY Downstate Coll Med & Med Ctr, Dept Emergency Med, Brooklyn, NY USA
[16] Kings Cty Hosp Ctr, Brooklyn, NY USA