1. Department of Infectious and Respiratory Critical Care Medicine Xinxiang Central Hospital, The Fourth Clinical College of Xinxiang Medical University Xinxiang China
2. School of Clinical Medicine, Guizhou Medical University Guiyang China
3. Department of Respiratory and Critical Care Medicine Huazhong Fuwai Cardiovascular Disease Hospital Zhengzhou China
4. Department of Pulmonary and Critical Care Medicine Henan Provincial People’s Hospital; People’s Hospital of Zhengzhou University; People’s Hospital of Henan University Zhengzhou 450003 China