[1] Chinese Acad Med Sci, Peking Union Med Coll Hosp, Dept Emergency, 1 Shuaifuyuan, Beijing 100730, Peoples R China
[2] Hebei Med Univ, Dept Emergency, Hosp 2, Shijiazhuang 050000, Hebei, Peoples R China
[3] Second Peoples Hosp Guiyang, Dept Emergency, Guiyang 550023, Guizhou, Peoples R China