[1] Univ Calgary, Cumming Sch Med, Dept Med, Calgary, AB, Canada
[2] Univ Calgary, Cumming Sch Med, Dept Community Hlth Sci, Calgary, AB, Canada
[3] St Pauls Hosp, Ctr Hlth Evaluat & Outcome Sci, Vancouver, BC, Canada
[4] Univ British Columbia, Vancouver, BC, Canada
[5] Arthrit Res Canada, Richmond, BC, Canada