1. San Juan Bautista School of Medicine Caguas Puerto Rico USA
2. McGill University Health Centre Research Institute Montreal Quebec Canada
3. Pediatric Pulmonary Medicine Vanderbilt University Medical Center Nashville Tennessee USA
4. Department of Pediatrics, Marsico Lung Institute University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
5. Department of Pediatrics and Basic Science Ponce Health Sciences University Ponce Puerto Rico USA