[1] Pontificia Univ Catolica Chile, Sch Med, Dept Pediat Infect Dis & Immunol, Santiago, Chile
[2] Clin San Felipe, Allergy Dept, Lima, Peru
[3] Hosp Aleman, Dermatol Dept, Buenos Aires, Argentina
[4] Amer Hlth Fdn AHF, Washington, DC USA
[5] Padre Bento Hosp, Sao Paulo, Brazil
[6] Amer Hlth Fdn AHF, Bogota, Colombia
[7] Natl Inst Pediat, Dept Dermatol, Mexico City, Mexico
[8] Univ Antioquia, Clin IPS Univ, Grp Clin & Expt Allergy, Medellin, Colombia
[9] Av Diagonal Paraguay 362 807, Santiago 8330077, Chile