1. Department of Infectious Diseases, Second Xiangya Hospital, Central South University, Changsha, China
2. Department of Respiratory and Critical Care Medicine, Second Xiangya Hospital, Central South University, Changsha, China
3. Research Unit of Respiratory Disease, Central South University, Changsha, China
4. Clinical Medical Research Center for Respiratory and Critical Care Medicine in Changsha China
5. Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, China