[1] Capital Med Univ, Beijing Shijitan Hosp, Dept Emergency Emergency & Crit Care Med Ctr, Beijing 100038, Peoples R China
[2] Chinese Peoples Liberat Army Gen Hosp, Dept Hlth Management Inst, Med Ctr 2, Beijing 100853, Peoples R China
[3] Capital Med Univ, Beijing Shijitan Hosp, Dept Infect Dis, Beijing 100038, Peoples R China
[4] Capital Med Univ, Beijing Chaoyang Hosp, Dept Resp & Crit Care Med, Beijing 100020, Peoples R China
[5] Capital Med Univ, Beijing Chaoyang Hosp, Dept Resp & Crit Care Med, 8 Gong Ti Nan Lu, Beijing 100020, Peoples R China