Liu, Ying
Zhou, Rui-min
Zhang, Ya-lan
Wang, Duo-quan
Li, Su-hua
Yang, Cheng-yun
Qian, Dan
Zhao, Yu-ling
Zhang, Hong-wei
Xu, Bian-li
Funding for this research was provided by:
Henan Provincial Health and Family Planning Commission (201602318)
Article History
Received: 12 December 2017
Accepted: 15 February 2018
First Online: 5 March 2018