[1] Univ Calgary, Calgary, AB, Canada
[2] Southlake Reg Hlth Ctr, Newmarket, ON, Canada
[3] St Joseph Hlth Care, London, ON, Canada
[4] Mt Sinai Hosp, Toronto, ON M5G 1X5, Canada
[5] Univ Sherbrooke, CHU Sherbrooke, Sherbrooke, PQ J1K 2R1, Canada
[6] Inst Rhumatol Montreal, Montreal, PQ, Canada
[7] Univ Manitoba, Winnipeg, MB, Canada
[8] Univ Toronto, Mt Sinai Hosp, Toronto, ON M5G 1X5, Canada
[9] Hosp Special Surg, Weill Cornell Med Coll, New York, NY 10021 USA