1. Department of Pediatrics, School of MedicineUniversidad Nacional de Colombia Bogota Colombia
2. Department of Pediatric Pulmonology and Pediatric Critical Care Medicine, School of MedicineUniversidad El Bosque Bogota Colombia
3. Department of Internal Medicine, School of MedicineUniversidad Nacional de Colombia Bogotá Colombia
4. Department of Pediatric Pulmonology, School of MedicinePontificia Universidad Catolica de Chile Santiago Chile