1 Second Affiliated Hospital of Guangdong Medical University, Zhanjiang, China.
2 Guangzhou Medical University, 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, China. Electronic address: chenriken@126.com.
3 Guangzhou Medical University, 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, China.
4 Guangzhou Eighth People's Hospital, Guangzhou Medical University, Zhanjiang, China.