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, Guangdong, China.
2. Nanshan School of Medicine, Guangzhou Medical University, Guangzhou, Guangdong, China.
3. International College of Education, Guangzhou Medical University, Guangzhou, Guangdong, China.