[1] McGill Univ, Toronto, ON, Canada
[2] Inst Clin Evaluat Sci, Toronto, ON, Canada
[3] Univ Toronto, Mt Sinai Hosp, Rheumatol, Toronto, ON, Canada
[4] Univ Toronto, Toronto, ON, Canada
[5] Southlake Reg Hlth Ctr, Newmarket, ON, Canada
[6] Univ Western Ontario, St Josephs Hlth Care, London, ON, Canada
[7] McGill Univ, Ctr Hlth, Div Rheumatol, Montreal, PQ, Canada
[8] McGill Univ, Ctr Hlth, Div Clin Epidemiol, Montreal, PQ, Canada