1. Department of Respiratory and Critical Care Medicine, The Fourth Hospital of Baotou, Baotou City, Inner Mongolia, China
2. Endoscopy Center, The Fourth Hospital of Baotou, Baotou City, Inner Mongolia, China
3. Department of Infectious Diseases, Baogang Third Hospital of Hongci Group, Baotou City, Inner Mongolia, China
4. Department of Respiratory and Critical Care Medicine, Hohhot First Hospital, Hohhot, Inner Mongolia, China
5. Department of Nursing, The Fourth Hospital of Baotou, Baotou City, Inner Mongolia, China
6. Department of Nephrology and Hematology, The Fourth Hospital of Baotou, Baotou City, Inner Mongolia, China
7. Medical Department, The Fourth Hospital of Baotou, Baotou City, Inner Mongolia, China