1. Intensive Care Unit, The Fourth People's Hospital of Qinghai Province, Xining, Qinghai 810000, P.R. China
2. Intensive Care Unit, The Fourth People's Hospital of Qinghai Province, Xining, Qinghai 810000, P.R. China
3. Intensive Care Unit, Shandong Chest Hospital, Jinan, Shandong 250000, P.R. China
4. Clinical Laboratory, Shijiazhuang Fifth People's Hospital, Shijiazhuang, Hebei 050000, P.R. China
5. Emergency Department, Qinghai Provincial People's Hospital, Xining, Qinghai 810007, P.R. China
6. Emergency Intensive Care Unit, Qinghai Red Cross Hospital, Xining, Qinghai 810000, P.R. China