[1] Univ Ottawa, Dept Family Med, 309-1580 Merivale Rd, Ottawa, ON K2G 4B5, Canada
[2] Western Univ, Schulich Sch Med & Dent, Dept Family Med, POB 5777,Stn B, London, ON N6A 4V2, Canada
[3] Western Univ, Schulich Sch Med & Dent, Schulich Interfac Program Publ Hlth, WCPHFM 4131,1465 Richmond St, London, ON N6G 2M1, Canada
[4] Western Univ, Schulich Sch Med & Dent, Dept Epidemiol & Biostat, WCPHFM 4131,1465 Richmond St, London, ON N6G 2M1, Canada