1. Department of Respiratory Medicine, The Second Xiangya Hospital of Central South University, Changsha 410000, Hunan, China
2. Department of Respiratory Medicine, The Fourth Hospital of Changsha, Changsha 410006, Hunan, China
3. Department of Anesthesiology, The Second Xiangya Hospital of Central South University, Changsha 410000, Hunan, China
4. Department of Infectious Diseases, The First Hospital of Changsha, Changsha 410000, Hunan, China