[1] St Michaels Hosp, Dept Med, Toronto, ON M5B 1W8, Canada
[2] Hosp Sick Children, Toronto, ON M5B 1W8, Canada
[3] Univ Toronto, Dept Publ Hlth Sci, Toronto, ON, Canada
[4] Sunnybrook & Womens Coll, Hlth Sci Ctr, Ctr Res Womens Hlth, Toronto, ON, Canada
[5] Univ Toronto, Dept Med, Toronto, ON, Canada
[6] Univ Toronto, Dept Hlth Policy, Toronto, ON, Canada
[7] Univ Toronto, Dept Management & Evaluat, Toronto, ON, Canada
[8] Univ Toronto, Dept Clin Epidemiol, Toronto, ON, Canada
[9] Univ Toronto, Hlth Care Res Program, Toronto, ON, Canada
[10] Univ Toronto, Dept Orthopaed Surg, Toronto, ON, Canada
[11] Toronto Western Hosp, Dept Orthopaed Surg, Toronto, ON M5T 2S8, Canada
[12] Toronto Western Hosp, Dept Hlth Policy, Toronto, ON M5T 2S8, Canada
[13] Univ Toronto, Dept Orthopaed Surg, Toronto, ON, Canada
[14] Sunnybrook & Womens Coll, Hlth Sci Ctr, Dept Orthopaed Surg, Toronto, ON, Canada
[15] Hosp Sick Children, Dept Surg, Toronto, ON M5G 1X8, Canada
[16] Hosp Sick Children, Dept Publ Hlth Sci, Toronto, ON M5G 1X8, Canada
[17] Hosp Sick Children, Dept Clin Epidemiol, Toronto, ON M5G 1X8, Canada
[18] Hosp Sick Children, Hlth Care Res Program, Toronto, ON M5G 1X8, Canada
[19] Univ Toronto, Dept Hlth Policy Management & Evaluat, Toronto, ON, Canada
[20] Univ Toronto, Dept Management & Adm, Toronto, ON, Canada