1 Department of Respiratory and Critical Care Medicine, Peking University People's Hospital, Beijing 100044, China.
2 Science and Education Department, Linfen Central Hospital, Shanxi 041000, China.
3 Department of Respiratory and Critical Care Medicine, Peking University People's Hospital, Beijing 100044, China. Electronic address: [email protected].
4 Department of Respiratory and Critical Care Medicine, Peking University People's Hospital, Beijing 100044, China. Electronic address: [email protected].