Central South University - National Clinical Research Center for Respiratory Diseases, Government of the People's Republic of China, Ministry of Health, Beijing Hospital, Department of Respiratory and Critical Care Medicine, Capital Medical University - Department of Epidemiology, Central South University - National Clinical Research Center for Respiratory Diseases, Central South University - National Clinical Research Center for Respiratory Diseases, Central South University - National Clinical Research Center for Respiratory Diseases, Central South University - National Clinical Research Center for Respiratory Diseases, Central South University - National Clinical Research Center for Respiratory Diseases, Central South University - National Clinical Research Center for Respiratory Diseases, Central South University - National Clinical Research Center for Respiratory Diseases, Central South University - National Clinical Research Center for Respiratory Diseases, Central South University - National Clinical Research Center for Respiratory Diseases, Central South University - National Clinical Research Center for Respiratory Diseases, Central South University - National Clinical Research Center for Respiratory Diseases and Jilin University (JLU) - Department of Respiratory Medicine