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Authors
Yan, Yousheng
Wang, Fang
Zhang, Chuan
Jin, Xiaohua
Zhang, Qinhua
Feng, Xuan
Hao, Shengju
Gao, Huafang
Ma, Xu
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Article History
Received: 21 May 2019
Revised: 2 August 2019
Accepted: 14 August 2019
First Online: 4 September 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the Ethics Committee of Gansu Province Maternal and Child Health Care Hospital.
: Written informed consent was provided by each included subject in this study.
