Liu, Yanhui
Yang, Bo
Zhang, Xiaoyan
Huang, Quanfei
Liu, Hailiang
Funding for this research was provided by:
Dongguan City Social Science and Technology Development Project (2015108101030)
Article History
Received: 12 September 2018
Accepted: 25 October 2018
First Online: 16 November 2018
Compliance with Ethical Standards
:
: The authors declare no conflict of interest.
: This study was approved by the Ethics Committee of Dongguan Maternal and Child Health Care Hospital.