1. Division of Pediatric Pulmonary Medicine, University of Pittsburgh School of Medicine and Pediatric Asthma Center, University of Pittsburgh Medical Center Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania;
2. Department of Pediatrics, Pediatric Pulmonology Unit, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil;
3. Department of Pediatric Pulmonology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile;
4. Pulmonary Unit, Internal Medicine Department, Hospital Universitario San Ignacio and Faculty of Medicine, Pontificia Universidad Javeriana, Bogota, Colombia;
5. Division of Pulmonary Sciences and Critical Care, University of Colorado Denver, Denver, Colorado;
6. Department of Medicine, Western University Canada, Schulich School of Medicine and Dentistry, London Health Sciences Centre, London, Ontario, Canada;
7. Division of Pediatric Pulmonary Medicine, Columbia University Irving Medical Center, New York, New York;
8. Post-Graduate Program of Medical Sciences, Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil;
9. Respiratory Center, Hospital de Niños Dr. Ricardo Gutiérrez, Ciudad Autónoma de Buenos Aires, Argentina; and
10. Division of Respiratory Medicine, University of British Columbia, British Columbia Children’s Hospital, Vancouver, British Columbia, Canada