1 Department of Pediatrics, School of Medicine, Universidad Nacional de Colombia, Bogota, Colombia; Department of Pediatric Pulmonology, Fundacion Hospital de La Misericordia, Colombia.
2 Department of Pediatrics, School of Medicine, Universidad Nacional de Colombia, Bogota, Colombia; Department of Pediatric Pulmonology, School of Medicine, Universidad El Bosque, Bogota, Colombia. Electronic address: carerodriguezmar@unal.edu.co.