1. Department of Respiratory and Critical Care Medicine, The 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. Center of Respiratory Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, China
5. Department of Respiratory Medicine, The First Attached Hospital of Shaoyang University, Shaoyang, Hunan, China
6. Department of Respiratory, The Eighth Hospital in Changsha, Hunan, China
7. Department of Respiratory, Longshan Hospital of Traditional Chinese Medicine, Hunan, China