[1] Univ Calif San Diego, San Diego State Univ, Joint Doctoral Program Publ Hlth, La Jolla, CA 92093 USA
[2] San Diego State Univ, Doctor Phys Therapy Program, San Diego, CA 92182 USA
[3] San Diego State Univ, Grad Sch Publ Hlth, San Diego, CA 92182 USA
[4] Univ Tennessee, Campbell Clin, Dept Orthopaed Surg & Biomed Engn, Memphis, TN USA
[5] RAND Corp, Hlth Care Div, Santa Monica, CA USA
[6] Brown Univ, Dept Family Med, Warren Alpert Med Sch, Providence, RI 02912 USA
[7] Brown Univ, Sch Publ Hlth, Dept Epidemiol, Providence, RI 02912 USA
[8] Univ Massachusetts, Med Sch, Dept Populat & Quantitat Sci, Amherst, MA 01003 USA
[9] Univ Massachusetts, Sch Med, Dept Med, Worcester, MA USA
[10] Univ Calif San Diego, Dept Family Med & Publ Hlth, 9500 Gilman Dr,Mail Code 0725, La Jolla, CA 92103 USA