1. Department of Allergy & Clinical Immunology; State Key Laboratory of Respiratory Disease; The First Affiliated Hospital of Guangzhou Medical University; Guangzhou China
2. The school of Medicine; The First Affiliated Hospital of Guangdong; Pharmaceutical University; Guangzhou China
3. The Department of Medicine; Firestone Institute for Respiratory Health; The Research Institute of St. Joe's Hamilton, St.Joseph's Healthcare; McMaster University; Hamilton ON Canada
4. Departments of Paediatrics; Prince of Wales Hospital; The Chinese University of Hong Kong; Hong Kong China