[1] Stanford Univ, Dept Orthopaed Surg, Sch Med, Stanford, CA 94305 USA
[2] Stanford Univ, Hosp & Clin, Orthopaed Spine Ctr, Stanford, CA 94305 USA
[3] Stanford Univ, Hosp & Clin, Spinal Surg Serv, Stanford, CA 94305 USA
[4] Univ Hawaii Manoa, Dept Publ Hlth Sci, John A Burns Sch Med, Honolulu, HI 96822 USA
[5] Univ Alberta, Sch Publ Hlth, Dept Publ Hlth Sci, Edmonton, AB T6G 2M7, Canada
[6] Univ Alberta, Sch Publ Hlth, Alberta Ctr Injury Control & Res, Edmonton, AB T6G 2M7, Canada
[7] NYU, Sch Med, Dept Orthopaed & Environm, New York, NY 10003 USA
[8] NYU, Sch Med, Dept Med, New York, NY 10003 USA
[9] NYU, Sch Med, Program Ergon & Biomech, New York, NY 10003 USA
[10] NYU, Grad Sch Arts & Sci, New York, NY 10003 USA
[11] NYU, Med Ctr, OIOC, New York, NY 10003 USA
[12] Univ British Columbia, Dept Med, Vancouver, BC V5Z 1M9, Canada
[13] Merck & Co Inc, Endocrinol Analgesia & Inflammat, Rahway, NJ 07065 USA
[14] Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden
[15] Univ Toronto, Dept Publ Hlth Sci, Toronto, ON, Canada
[16] Univ Toronto, Dept Hlth Policy Management & Evaluat, Toronto, ON, Canada
[17] Toronto Western Hosp, Univ Hlth Network Rehabil Solut, CREIDO, Toronto, ON M5T 2S8, Canada
[18] Inst Work & Hlth, Toronto, ON, Canada
[19] Univ Hlth Network, Toronto Western Res Inst, Div Hlth Care & Outcomes Res, Toronto, ON, Canada
[20] Univ Calif Irvine, Dept Neurol, Irvine, CA 92717 USA
[21] Univ Calif Los Angeles, Sch Publ Hlth, Dept Epidemiol, Los Angeles, CA 90024 USA