1. Institute of Respiratory Diseases, Xinqiao Hospital of the Third Military Medical University, Chongqing 400037, China
2. Bethune International Peace Hospital of PLA, Shijiazhuang, Hebei 050000, China
3. Center for Disease Control and Prevention of Zhengzhou City and First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450000, China
4. College of High Altitude Military Medicine, Third Military Medical University, Chongqing 400038, China
5. Department of Respiration, Tongren City People’s Hospital, Guizhou 554300, China
6. Department of Emergency, The First Affiliated Hospital of Nanchang University, Nanchang 330006, China