[1] Capital Med Univ, Beijing Chaoyang Hosp, Dept Emergency Med, Beijing Key Lab Cardiopulm Cerebral Resuscitat, Beijing, Peoples R China
[2] Capital Med Univ, Beijing Chaoyang Hosp, Beijing Inst Resp Med, Beijing, Peoples R China
[3] Capital Med Univ, Beijing Xuanwu Hosp, Dept Emergency Med, Beijing, Peoples R China
[4] Capital Med Univ, Beijing Tongren Hosp, Dept Emergency Med, Beijing, Peoples R China
[5] Beijing Hepingli Hosp, Dept Emergency Med, Beijing, Peoples R China
[6] China Japan Friendship Hosp, Dept Emergency Med, Beijing, Peoples R China
[7] Beijing Fuxing Hosp, Dept Emergency Med, Beijing, Peoples R China
[8] Beijing Jishuitan Hosp, Dept Emergency Med, Beijing, Peoples R China
[9] Peking Univ, Shougang Hosp, Dept Emergency Med, Beijing 100871, Peoples R China
[10] Capital Med Univ, Beijing Friendship Hosp, Dept Emergency Med, Beijing, Peoples R China
[11] Capital Med Univ, Beijing Tiantan Hosp, Dept Emergency Med, Beijing, Peoples R China
[12] 309th Hosp Chinese Peoples Liberat Army, Dept Emergency Med, Beijing, Peoples R China
[13] Beijing Huairou Hosp, Dept Emergency Med, Beijing, Peoples R China