[Tang, Ke; Shao, Xiaodan; Zhang, Yan; Wang, Na; Zhang, Y] Univ South China, Sch Nursing, 28 Changsheng West Rd, Hengyang 421001, Hunan, Peoples R China.
[Jiang, Yuting; Zhang, Yan; Wang, Kunning; Zhang, Y; Shen, Zhiwei] Univ South China, Inst Pathogen Biol, Hengyang Med Sch, Hengyang 421001, Hunan, Peoples R China.
[Tan, Zhangyan; Xie, Jiangxiu] Univ South China, Affiliated Hosp 2, Dept Obstet, Hengyang 421001, Hunan, Peoples R China.