1. Department of Pediatric Pulmonology and Cardiology; School of Medicine; Pontificia Universidad Católica de Chile; Santiago Chile
2. Department of Pediatrics; School of Medicine; Universidad Nacional de Colombia; Bogotá Colombia
3. Department of Pediatric Pulmonology and Pediatric Critical Care Medicine; School of Medicine; Universidad El Bosque; Bogotá Colombia
4. Departments of Pediatrics and of Social and Preventive Sciences; University of Montreal; Montreal Canada
5. Research Centre; CHU Sainte-Justine; Montreal Canada