[1] Amer Univ Beirut, Med Ctr, Clin Res Inst, Beirut, Lebanon
[2] Univ Ottawa, Bruyere Res Inst, Ottawa, ON, Canada
[3] Univ Ottawa, Fac Med, Sch Epidemiol & Publ Hlth, Ottawa, ON, Canada
[4] McMaster Univ, Dept Clin Epidemiol & Biostat, Hamilton, ON, Canada
[5] Bruyere Res Inst, CT Lamont Primary Hlth Care Res Ctr, Ottawa, ON, Canada
[6] Glasgow Caledonian Univ, Nursing Midwifery & Allied Hlth Profess Res Unit, Glasgow, Lanark, Scotland
[7] Univ Glasgow, MRC CSO Social & Publ Hlth Sci Unit, Glasgow, Lanark, Scotland
[8] La Trobe Univ, Ctr Hlth Commun & Participat, Sch Psychol & Publ Hlth, Bundoora, Vic, Australia
[9] Plymouth Univ, Peninsula Sch Med & Dent, Peninsula Dent Sch, Plymouth, Devon, England
[10] Amer Coll Physicians, Annals Internal Med, Washington, DC USA
[11] Govt Canada, Publ Hlth Agcy Canada, Ctr Surveillance & Appl Res Hlth Promot, Appl Res Div, Ottawa, ON, Canada
[12] Govt Canada, Chron Dis Prevent Branch, Publ Hlth Agcy Canada, Ottawa, ON, Canada
[13] Publ Hlth Agcy Canada, Global Hlth & Guidelines Div, Ottawa, ON, Canada
[14] Oregon Hlth & Sci Univ, Dept Obstet & Gynecol, Portland, OR 97201 USA
[15] Oregon Hlth & Sci Univ, Dept Med Informat & Clin Epidemiol, Portland, OR 97201 USA
[16] Oregon Hlth & Sci Univ, Dept Publ Hlth & Prevent Med, Portland, OR 97201 USA
[17] Oregon Hlth & Sci Univ, Dept Emergency Med, Portland, OR 97201 USA
[18] Univ Ottawa, Fac Med, Dept Med, Ottawa, ON, Canada
[19] Amer Univ Beirut, Dept Internal Med, Riad El Solh St, Beirut, Lebanon
[20] McMaster Univ, Dept Hlth Res Methods Evidence & Impact HEI, Hamilton, ON, Canada