[He, Guoping; Wang, Weihong] Cent S Univ, Sch Nursing, Changsha 410013, Hunan, Peoples R China.
[Wang, Meirong] Nanhua Univ, Affiliated Hosp 1, Hengyang, Peoples R China.
[Tang, Huaqing; Wang, Weihong; Liu, Lihua] Hunan Normal Univ, Sch Med, Changsha, Hunan, Peoples R China.
[He, Guoping] Cent S Univ, Sch Nursing, 172 Tongzipo Rd, Changsha 410013, Hunan, Peoples R China.