1 Shanghai Jiao Tong University Medical School Affiliated Ruijin Hospital, Shanghai, China.
2 Kunshan Hospital of Chinese Medicine, Affiliated Hospital of Yangzhou University, Department of Emergency and Critical Care Medicine, Shanghai, China.
3 Shanghai Jiao Tong University Medical School Affiliated Ruijin Hospital, Respiratory and Critical Care Medicine, Shanghai, China.
4 Shanghai Jiao Tong University Medical School Affiliated Ruijin Hospital, Respiratory and Critical Care Medicine, Shanghai, China; liqingyun68@hotmail.com.