[1] Univ Penn, Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA
[2] Vet Affairs Med Ctr, Albany, NY USA
[3] Albany Med Coll, Albany, NY 12208 USA
[4] South Georgia Vet Hlth Syst, Res Enhancement Award Program North Florida, Rehabil Res & Dev Rehabil Outcomes Res Ctr, Dept Vet Affairs Hlth Serv Res & Dev, Gainesville, FL USA
[5] Univ Florida, Coll Med, Dept Hlth Outcomes & Policy, Gainesville, FL USA
[6] Vet Affairs Med Ctr, Gainesville, FL 32608 USA
[7] Univ Penn, Dept Phys Med & Rehabil, Philadelphia, PA 19104 USA