[Luo, Biru; Liao, Shujuan; Wang, Yan] Sichuan Univ, West China Univ Hosp 2, Dept Nursing, Chengdu 610041, Peoples R China.
[Luo, Biru; Liao, Shujuan; Wang, Yan] Sichuan Univ, Key Lab Birth Defects & Related Dis Women & Child, Minist Educ, Chengdu 610041, Peoples R China.
[Wu, Xiaoqin] Peoples Hosp Jiawang Dist Xuzhou, Xuzhou 221011, Jiangsu, Peoples R China.
[Li, Xiaoxia] Yaan Polytech Coll, Yaan 625100, Peoples R China.