1. Investigational Unit, Hospital Medica Sur, Mexico City, Mexico;
2. Pediatric Pulmonology and Allergy Unit, Children’s Hospital La Fe, Instituto de Investigacion La Fe, Valencia, Spain;
3. Department of Biochemistry and Molecular Biology, School of Chemistry, Complutense University of Madrid, Madrid, Spain;
4. School of Medicine, Institute of Biomedical Research, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre/RS, Brazil;
5. Pediatric Pulmonology, Hospital Materno Infantil José Domingo de Obaldía, Hospital Chiriquí, David, Panamá