[1
]Department of Pulmonary and Critical Care MedicineSecond Xiangya Hospital, Central
South University Changsha Hunan 410011 China
[2
]Research Unit of Respiratory DiseaseCentral South University Changsha Hunan 410011
China
[3
]Diagnosis and Treatment Center of Respiratory DiseaseCentral South University Changsha
Hunan 410011 China
[4
]Department of Respiratory MedicineZhuzhou Central Hospital Zhuzhou Hunan 412000 China
[5
]Department of Respiratory MedicineYueyang Second People's Hospital, Designated Hospital
of Junshan District Yueyang Hunan 414005 China
[6
]Department of Respiratory and Critical MedicineXiangtan Central Hospital Xiangtan
Hunan 411100 China
[7
]Department of Emergency MedicineSecond Xiangya Hospital, Central South University
Changsha Hunan 410011 China
[8
]Department of Respiratory MedicineFirst Attached Hospital of Shaoyang University Shaoyang
Hunan 422001 China
[9
]Department of Respiratory MedicineAffiliated Shaoyang Central Hospital of University
of South China Shaoyang Hunan 422001 China