1 Department of Respiratory and Critical Care Medicine, Qingdao Municipal Hospital Group, Qingdao, Shandong Province, 266000, People's Republic of China.
2 School of Clinical Medicine, Shandong Second Medical University, Weifang, Shandong Province, 261000, People's Republic of China.
3 Hospital-Acquired Infection Control Department, Qingdao Municipal Hospital Group, Qingdao, Shandong Province, 266000, People's Republic of China.
4 Medical Department of Qingdao University, Qingdao University, Qingdao, Shandong Province, 266000, People's Republic of China.
5 Human Resources Department, Qingdao Municipal Hospital Group, Qingdao, Shandong Province, 266000, People's Republic of China.