1. Department of Pulmonary Function, The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou, China;
2. Department of Respiratory Medicine, The Second Clinical College of Guangzhou University of Chinese Medicine, Guangdong Provincial Academy of Chinese Medical Sciences, Guangzhou, China;
3. Department of Key Unit of Methodology in Clinical Research, The Second Clinical College of Guangzhou University of Chinese Medicine, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China