[1] Hosp Sick Children, Childrens Hosp Eastern Ontario, Div Rheumatol, Ottawa, ON, Canada
[2] Childrens Hosp Eastern Ontario, Div Rheumatol, Ottawa, ON, Canada
[3] Hosp Sick Children, Dept Psychol, Toronto, ON, Canada
[4] Hosp Sick Children, Toronto, ON, Canada
[5] Hosp Sick Children, Brampton, ON, Canada
[6] Univ Toronto, Toronto, ON, Canada
[7] Michigan State Univ, Grand Rapids, MI USA