[1] Erasmus MC, Dept Epidemiol, Rotterdam, Netherlands
[2] Ottawa Hosp Res Inst, Ctr Journalol, Ottawa, ON, Canada
[3] Ottawa Hosp Res Inst, Knowledge Synth Grp, Clin Epidemiol Program, Ottawa, ON, Canada
[4] Inst Hlth Carlos III, Natl Sch Publ Hlth, Dept Hlth Planning & Econ, Madrid, Spain
[5] Univ Valencia, Dept Med, INCLIVA, Hlth Res Inst, Valencia, Spain
[6] CIBERSAM, Valencia, Spain
[7] Univ Ottawa, Dept Undergrad Med Educ, Fac Med, Ottawa, ON, Canada
[8] Inst Hlth Econ, Edmonton, AB, Canada
[9] Univ Ottawa, Fac Med, Ottawa, ON, Canada
[10] Univ Oxford, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Ctr Stat Med, Oxford, England
[11] Ottawa Hosp Res Inst, Canadian EQUATOR Ctr, Clin Epidemiol Program, Ottawa, ON, Canada