作者单位:Univ Alberta, Fac Med & Dent, Div Pediat Rheumatol, Edmonton, AB, Canada[1]Univ Calgary, Div Rheumatol, HRIC 3AA20,3280 Hosp Dr NW, Calgary, AB T2N 4Z6, Canada[2]Univ Western Ontario, Div Rheumatol, Med, London, ON, Canada[3]Univ Toronto, Toronto Western Res Inst, Toronto, ON, Canada[4]