[1] Huazhong Univ Sci & Technol, Tongji Med Coll, Dept Social Med & Hlth Management, Wuhan, Peoples R China
[2] Huazhong Univ Sci & Technol, Tongji Hosp, Tongji Med Coll, Dept Anesthesiol, Wuhan, Peoples R China
[3] Univ Elect Sci & Technol China, Sichuan Prov Peoples Hosp, Dept Emergency Med, Chengdu, Peoples R China
[4] Hainan Med Univ, Chinese Acad Med Sci, Res Unit Isl Emergency Med, Haikou, Hainan, Peoples R China
[5] Hainan Med Univ, Minist Educ, Key Lab Emergency & Trauma, Haikou, Hainan, Peoples R China