作者单位：Univ Toronto, Mt Sinai Hosp, Div Rheumatol, Toronto, ON M5S 1A1, Canada[1]Univ Western Ontario, Schulich Sch Med & Dent, London, ON, Canada[2]Inst Rhumatol, Rheumat Dis Unit, Montreal, PQ, Canada[3]Canadian Rheumatol Res Consortium, Toronto, ON, Canada[4]Univ Ottawa, Div Rheumatol, Ottawa, ON K1N 6N5, Canada[5]Southlake Reg Hlth Ctr, Newmarket, ON, Canada[6]
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