[1] Jilin Univ, Sch Nursing, 965 Xinjiang St, Changchun 130021, Jilin, Peoples R China
[2] Hangzhou Normal Univ, Sch Nursing, Hangzhou, Zhejiang, Peoples R China
[3] Beian No 2 Peoples Hosp, Dept Internal Med, Beian, Heilongjiang, Peoples R China
[4] Xinjiang Med Univ, Sch Nursing, Urumqi, Xinjiang, Peoples R China