[Pan, Rong-jia; Zeng, Gu-qing; Zeng, GQ; Wu, Jing-jing; Wang, Man-yi; Nian, Fang] Univ South China, Sch Nursing, Hengyang Med Sch, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
[Peng, Dan; Ni, Xiao-Yan; Gui, Si-jie; Peng, D] Cent South Univ, Dept Orthoped, Xiangya Hosp 2, Changsha 410011, Hunan, Peoples R China.
[He, Yu-Lian; Zhou, Yan-hui] Univ South China, Affiliated Hosp 1, Hengyang Med Sch, Dept Orthoped & Trauma, Hengyang 421001, Hunan, Peoples R China.
[Liang, Jing-hong] Sun Yat Sen Univ, Sch Publ Hlth, Dept Maternal & Child Hlth, 74 Zhongshan 2nd Rd, Guangzhou 510080, Peoples R China.