[1] Virginia Commonwealth Univ Rehabil Psychol & Neur, VCU W Hosp, Dept Phys Med & Rehabil, Richmond, VA 23298 USA
[2] Virginia Commonwealth Univ, Dept Biostat, Richmond, VA USA
[3] Virginia Commonwealth Univ, Dept Phys Med & Rehabil, Richmond, VA USA
[4] Harvard Univ, Sch Med, Dept Phys Med & Rehabil, Spaulding Rehabil Hosp, Boston, MA USA
[5] Northeastern Univ, Dept Speech Language Pathol & Audiol, Boston, MA 02115 USA
[6] Univ Texas SW Med Ctr Dallas, Dept Neurol, Dallas, TX 75390 USA
[7] Univ Colorado, Sch Med, Craig Hosp, Dept Phys Med & Rehabil, Englewood, CO USA