[1] Dalian Univ, Sch Nursing, Dalian 116622, Peoples R China
[2] Jilin Univ, Sch Publ Hlth, Changchun 130021, Peoples R China
[3] Dalian Med Univ, Sch Nursing, Dalian 116044, Peoples R China
[4] Dalian Univ, Affiliated Zhongshan Hosp, Emergency Dept, Dalian 116001, Peoples R China