[1] Univ Calgary, Dept Med, Calgary, AB, Canada
[2] Algoma Dist Med Grp, Sault Ste Marie, ON, Canada
[3] Univ Toronto, Dept Med, Toronto, ON, Canada
[4] McMaster Univ, Dept Family Med, Hamilton, ON L8S 4L8, Canada
[5] St Josephs Healthcare, Ctr Evaluat Med, Hamilton, ON, Canada
[6] St Josephs Hosp, Program Assessment Technol Hlth, Res Inst, Hamilton, ON, Canada
[7] McMaster Univ, Dept Clin Epidemiol & Biostat, Hamilton, ON, Canada
[8] Grp Hlth Ctr, Dept Phys Therapy, Sault Ste Marie, ON, Canada
[9] Algoma Publ Hlth, Sault Ste Marie, ON, Canada
[10] Lake Super State Univ, Dept Biol, Sault Ste Marie, ON, Canada
[11] Univ Alberta, Dept Med, Edmonton, AB, Canada
[12] Grp Hlth Ctr, Dept Clin Res, Sault Ste Marie, ON, Canada
[13] Univ Western Ontario, Dept Epidemiol & Biostat, Schulich Sch Med & Dent, London, ON, Canada