[1] Univ Ljubljana, Med Ctr, Univ Childrens Hosp, Dept Allergol, SL-1525 Ljubljana, Slovenia
[2] Univ Ljubljana, Med Ctr, Univ Childrens Hosp, Dept Rheumatol, Ljubljana 61000, Slovenia
[3] Univ Ljubljana, Med Ctr, Univ Childrens Hosp, Dept Clin Immunol, Ljubljana 61000, Slovenia
[4] Univ Toronto, Hosp Sick Children, Dept Pediat, Toronto, ON M5G 1X8, Canada
[5] Univ Toronto, Hosp Sick Children, Dept Immunol, Div Rheumatol, Toronto, ON M5G 1X8, Canada