[1] Northwestern Univ, Feinberg Sch Med, Ctr Healthcare Studies, Inst Publ Hlth & Med, Chicago, IL USA
[2] Rehabil Inst Chicago, Ctr Rehabil Outcomes Res, 345 E Super St, Chicago, IL 60611 USA
[3] Northwestern Univ, Feinberg Sch Med, Dept Phys Med & Rehabil, Chicago, IL USA
[4] Edward Hines Jr VA Hosp, Dept Vet Affairs, Hlth Serv Res & Dev, Hines, IL USA
[5] Ctr Evaluat Practices & Experiences Patient Ctr C, Dept Vet Affairs, Hines, IL USA
[6] RTI Int, Chicago, IL USA