[1] BMJ Evidence Based Med, London WC1H 9JR, England
[2] Heinrich Heine Univ Dusseldorf, Med Fac, Inst Gen Practice, Dusseldorf, Germany
[3] Cochrane, Evidence Prod & Methods Directorate, Methods Support Unit, London, England
[4] Inst Univ Hosp Italiano Buenos Aires, Res Dept, Buenos Aires, DF, Argentina
[5] Leiden Univ, Dept Biomed Data Sci, Med Decis Making, Med Ctr, Leiden, Netherlands
[6] Mayo Clin, Knowledge & Evaluat Res Unit, Rochester, MN USA
[7] Univ Valparaiso, Interdisciplinary Ctr Hlth Studies CIESAL, Cochrane Chile Associate Ctr, Vina Del Mar, Chile
[8] Univ Oxford, Ctr Evidence Based Med, Nuffield Dept Primary Care Hlth Sci, Oxford, England
[9] Univ Oxford, Global Ctr Healthcare & Urbanisat, Oxford, England
[10] Univ British Columbia, Fac Med, Vancouver, BC, Canada
[11] Hosp Italiano Buenos Aires, Family & Community Med Div, Buenos Aires, DF, Argentina
[12] St Michaels Hosp, Knowledge Translat Program, Li Ka Shing Knowledge Inst, Toronto, ON, Canada
[13] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada