[1] Emory Univ, Dept Neurol, Sch Med, Atlanta, GA USA
[2] Emory Univ, Dept Hlth Policy, Sch Med, Atlanta, GA USA
[3] Massachusetts Gen Hosp, Dept Neurol, Boston, MA USA
[4] Harvard Med Sch, Dept Neurol, Boston, MA USA
[5] Emory Univ, Sch Med, Fac Off Bldg,Grady Campus 49 Jesse Hill Jr Dr SE,O, Atlanta, GA 30303 USA