[1] Univ Ottawa, Inst Populat Hlth, Ottawa, ON K1N 6N5, Canada
[2] Ottawa Hosp Res Inst, Canadian Cochrane Ctr, Ottawa, ON, Canada
[3] Univ Ottawa, Dept Med, Ottawa, ON K1N 6N5, Canada
[4] Ottawa Hosp, Ottawa Hosp Res Inst, Clin Epidemiol Unit, Ottawa, ON, Canada
[5] Alfred Hosp, Melbourne, Vic, Australia
[6] Monash Univ, Melbourne, Vic 3004, Australia
[7] Natl Trauma Res Inst, Melbourne, Vic, Australia
[8] Monash Univ, Alfred Hosp, Natl Trauma Res Inst, Melbourne, Vic 3181, Australia
[9] Cochrane Collaborat Musculoskeletal Review Grp, Ottawa, ON, Canada