[1] Univ British Columbia, Dept Family Practice, Fac Med, Vancouver, BC, Canada
[2] Vancouver Coastal Hlth Res Inst, Ctr Clin Epidemiol & Evaluat C2E2, Vancouver, BC, Canada
[3] Vancouver Coastal Hlth Author VCHA, Dept Family & Community Practice, Vancouver, BC, Canada
[4] BC Childrens Hosp, Complex Care Program, Vancouver, BC, Canada
[5] Univ British Columbia, Dept Pediat, Div Gen Pediat, Vancouver, BC, Canada
[6] Univ British Columbia, Resp Med Div, Vancouver, BC, Canada
[7] Simon Fraser Univ, Fac Hlth Sci, Burnaby, BC, Canada
[8] Arthrit Res Canada, Vancouver, BC, Canada
[9] Univ British Columbia, Dept Med, Fac Med, Vancouver, BC, Canada
[10] Univ British Columbia, Sch Populat & Publ Hlth, Vancouver, BC, Canada