1. Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, P.R. China;
2. Department of Pathology, He Xian Memorial Hospital of Panyu District, He Xian Memorial Affiliated Hospital of Southern Medical University, Guangzhou, P.R. China; and
3. Guangzhou National Laboratory, Guangzhou, P.R. China