1. Department of Pediatrics; School of Medicine; Universidad Nacional de Colombia; Bogota Colombia
2. Research Unit; Military Hospital of Colombia; Bogota Colombia
3. Division of Pediatric Pulmonary; Sleep Medicine and Integrative Systems Biology, Center for Genetic Research, Children's National Medical Center, George Washington University; Washington District of Columbia
4. Department of Pediatrics and Family Medicine; School of Medicine, Pontificia Universidad Catolica de Chile; Santiago Chile