[Zeng, Ying; He, Guo-Ping] Cent S Univ, Sch Nursing, Changsha, Hunan, Peoples R China.
[Zeng, Ying; Huang, Yan-Jin] Univ S China, Sch Nursing, Hengyang, Hunan, Peoples R China.
[Yi, Guang-Hui] Univ S China, Sch Med, Inst Cardiovasc Dis, Hengyang, Hunan, Peoples R China.
[Zhang, Qing-Hai] Univ S China, Affiliated Hosp 1, Hengyang, Hunan, Peoples R China.
[He, Ling-Ling] Univ S China, Affiliated Hosp 2, Hengyang, Hunan, Peoples R China.