[1] Childrens Hosp Wisconsin, Div Pediat Rheumatol, Med Coll Wisconsin, Milwaukee, WI 53201 USA
[2] Indiana Univ Sch Med, Div Pediat Rheumatol, Indianapolis, IN 46202 USA
[3] Hosp Sick Children, Div Pediat Rheumatol, Toronto, ON, Canada
[4] Childrens Hosp Montefiore, Div Pediat Rheumatol, Albert Einstein Coll Med, Bronx, NY USA