[1] Georgetown Univ, Collaborat Res Outcomes and Metr, Washington, DC USA
[2] Georgetown Univ, Dept Neurol Biostat Bioinformat & Biomath, Med Ctr, Washington, DC USA
[3] Georgetown Univ, Dept Rehabil Med, Med Ctr, Washington, DC USA
[4] MedStar Natl Rehabil Hosp, Washington, DC USA
[5] MedStar Hlth Res Inst, Hyattsville, MD USA
[6] Georgetown Univ, Neurol, 207 Bldg D,4000 Reservoir Rd NW, Washington, DC 20057 USA