1Huizhou Central People's Hospital, Huizhou, Guangdong, People's Republic of China
2Department of Allergy and Clinical Immunology, Guangzhou Institute of Respiratory Health, State Key Laboratory of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, People's Republic of China
3People's Hospital of Yangjiang, Yangjiang, Guangdong, People's Republic of China