1. Department of Pediatrics, Fundación Santa Fe de Bogotá, Bogotá, Colombia.
2. Departments of Pediatrics, Clinical Epidemiology, and Biostatistics, Pontificia Universidad Javeriana, Bogotá, Colombia.
3. Pulmonology Unit, Department of Pediatrics, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
4. School of Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom.
5. Southampton Children's Hospital, Southampton, United Kingdom.