1. Department of Paediatrics, Hanoi University of Medicine, Hanoi, Vietnam
2. Department of Immunology, Allergology and Rheumatology, National Hospital of Paediatrics, Hanoi, Vietnam
3. Department of Respiratory Diseases, Medical-Biological Research Center, Lam Dong Medical College, Dalat, Vietnam
4. Department of Pulmonology and Respiratory Physiology, Cochin Hospital, Paris Descartes University, Paris, France
5. Department of Asthma and Immuno-Allergology, Penn State Medical College, Hershey, PA, USA