[1] Univ Fed Sao Paulo, Dept Pediat, Div Allergy Clin Immunol & Rheumatol, Sao Paulo, Brazil
[2] McGill Univ Hlth Ctr, Div Dermatol, Montreal, PQ, Canada
[3] McGill Univ Hlth Ctr, Dept Pediat, Div Pediat Allergy Clin Immunol & Dermatol, Montreal, PQ, Canada