[Zhuang, Xinqi; Lei, Xiaoyu; Zhang, Yin-Ping; Zhang, YP; Zhang, Dandan; Zhang, Jianzhong] Xi An Jiao Tong Univ, Hlth Sci Ctr, Sch Nursing, West Yanta Rd 76, Xian 710061, Shaanxi, Peoples R China.
[Zhang, Dandan] Univ South China, Affiliated Nanhua Hosp, Inst Clin Res, Hengyang Med Sch, Hengyang, Hunan, Peoples R China.
[Liu, Fen] Univ South China, Affiliated Hosp 1, Hengyang Med Sch, Dept Gynecol & Obstet, Hengyang, Hunan, Peoples R China.
[Cui, Tianxin] Univ Edinburgh, Sch Hlth Social Sci, Edinburgh, Scotland.