[1] London Sch Hyg & Trop Med, 15-17 Tavistock Pl, London WC1H 9SH, England
[2] Amer Univ Beirut, Dept Epidemiol & Populat Hlth, Beirut, Lebanon
[3] Univ Ottawa, Fac Social Sci, Sch Psychol, Ottawa, ON L8S 4L8, Canada
[4] McMaster Univ, Dept Hlth Res Methods Evidence & Impact, 1280 Main St W, Hamilton, ON L8S 4L8, Canada
[5] Bruyere Res Inst, Ottawa, ON, Canada
[6] Univ Ottawa, Bruyere Res Inst, Dept Family Med, Ottawa, ON L8S 4L8, Canada
[7] Univ Ottawa, Bruyere Res Inst, Dept Med, Ottawa, ON L8S 4L8, Canada
[8] Ottawa Hosp Res Inst, Ottawa, ON L8S 4L8, Canada
[9] Univ Ottawa, Sch Epidemiol & Publ Hlth, Ottawa, ON L8S 4L8, Canada