[1] Univ British Columbia, Women & Childrens Hlth Sci, Vancouver, BC, Canada
[2] BC Childrens Hosp Res Inst, Div Rheumatol, Dept Pediat, Vancouver, BC, Canada
[3] Hosp Sick Children, Toronto, ON, Canada
[4] Univ British Columbia, Vancouver, BC, Canada
[5] BC Childrens Hosp Res Inst, Vancouver, BC, Canada
[6] BC Childrens Hosp, Div Rheumatol, Dept Pediat, Vancouver, BC, Canada