[1] Harvard Med Sch, Ctr Adv Orthopaed Studies, Beth Israel Deaconess Med Ctr, Boston, MA USA
[2] Harvard Med Sch, Dept Orthopaed Surg, Boston, MA USA
[3] Calif Pacif Med Ctr, Res Inst, San Francisco, CA USA
[4] Univ Calif Davis, Dept Med, Davis, CA USA
[5] ON Diagnost, Berkeley, CA USA
[6] Univ Calif San Francisco, San Francisco, CA USA
[7] Univ Minnesota, Div Epidemiol & Community Hlth, Minneapolis, MN USA
[8] Univ Minnesota, Dept Med, Minneapolis, MN USA
[9] Oregon Hlth & Sci Univ, Portland, OR USA
[10] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA USA
[11] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Boston, MA USA