[1] Hosp Infantil Mex Federico Gomez, Alergia Inmunol Clin, Mexico City 06720, Mexico
[2] Univ Salle Mexico, Fac Mexicana Med, Mexico City 14000, Mexico
[3] Univ Juarez Autonoma Tabasco, Hlth Sci Acad Div DACS, Villahermosa 86040, Mexico
[4] Pontificia Univ Catolica Chile, Sch Med, Dept Pediat Pulmonol, Santiago 7820436, Chile