1. Department of Pulmonary and Critical Care Medicine, Second Xiangya Hospital Central South University Changsha Hunan China
2. Research Unit of Respiratory Disease Central South University Changsha Hunan China
3. Diagnosis and Treatment Center of Respiratory Disease Central South University Changsha Hunan China
4. Department of Respiratory Medicine Zhuzhou Central Hospital Zhuzhou Hunan China
5. Department of Respiratory Medicine, Yueyang Second People's Hospital Designated Hospital of Junshan District Yueyang Hunan China
6. Department of Respiratory and Critical Medicine Xiangtan Central Hospital Xiangtan Hunan China
7. Department of Emergency Medicine, Second Xiangya Hospital Central South University Changsha Hunan China
8. Department of Respiratory Medicine First Attached Hospital of Shaoyang University Shaoyang Hunan China
9. Department of Respiratory Medicine Affiliated Shaoyang Central Hospital of University of South China Shaoyang Hunan China