[1] Womens Coll Hosp, Womens Coll Res Inst, Toronto, ON M5G 1N8, Canada
[2] Inst Clin Evaluat Sci, Toronto, ON, Canada
[3] Univ Toronto, Dept Hlth Policy Management & Evaluat, Toronto, ON, Canada
[4] Univ Toronto, Dept Med, Toronto, ON, Canada
[5] St Michaels Hosp, Dept Med, Toronto, ON M5B 1W8, Canada
[6] St Michaels Hosp, Keenan Res Ctr, Li Ka Shing Knowledge Inst, Toronto, ON M5B 1W8, Canada
[7] Sunnybrook Hlth Sci Ctr, Clin Epidemiol & Hlth Serv Res Program, Toronto, ON M4N 3M5, Canada