[1] Rutgers Robert Wood Johnson Med Sch, Pediat Rheumatol, New Brunswick, NJ USA
[2] Texas Childrens Hosp, Baylor Coll Med, Pediat Rheumatol, Houston, TX 77030 USA
[3] Univ Michigan, Pediat Rheumatol & Hlth Serv Res, Ann Arbor, MI 48109 USA
[4] Ann & Robert H Lurie Childrens Hosp Chicago, Div Rheumatol, Chicago, IL 60611 USA
[5] Boston Childrens Hosp, Div Emergency Med, Boston, MA USA
[6] Emory Univ, Sch Med, Pediat Rheumatol, Atlanta, GA USA
[7] Univ Iowa, Dept Pediat Rheum, Iowa City, IA USA
[8] Schneider Childrens Hosp, New Hyde Pk, NY USA
[9] Cincinnati Childrens Hosp Med Ctr, Pediat Rheumatol Collaborat Study Grp, Cincinnati, OH 45229 USA
[10] Emory Univ, Sch Med, Atlanta, GA USA
[11] Childrens Healthcare Atlanta, Atlanta, GA USA
[12] Hosp Sick Children, Div Rheumatol, Toronto, ON M5G 1X8, Canada
[13] Univ Toronto, Toronto, ON, Canada
[14] Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Med,Div Rheumatol Immunol & Allergy, Boston, MA 02115 USA