[1] Hosp Sick Children, Div Pediat Med, Pediat Outcomes Res Team, Dept Pediat & Med, Toronto, ON M5G 1X8, Canada
[2] Hosp Sick Children, Div Rheumatol, Dept Pediat & Med, Toronto, ON M5G 1X8, Canada
[3] Hosp Sick Children, Dept Qual & Risk Management, Toronto, ON M5G 1X8, Canada
[4] Univ Toronto, Toronto, ON, Canada