[1] Northwestern Univ, Feinberg Sch Med, Phys Med & Rehabil, 355 East Erie St, Chicago, IL 60611 USA
[2] Shirley Ryan AbilityLab, Ctr Rehabil Outcomes Res, 355 East Erie St, Chicago, IL 60611 USA
[3] Johns Hopkins Univ, Sch Med, Dept Phys Med & Rehabil, Baltimore, MD USA
[4] Northwestern Univ, Dept Prevent Med, Div Biostat, Feinberg Sch Med, Chicago, IL 60611 USA
[5] Shirley Ryan Abil Lab, Spinal Cord Innovat Ctr, Chicago, IL USA