Li, Jing
Wang, Ze
Wei, Daimin
Liu, Hong
Zhang, Jiangtao
Wang, Jianfeng
Shi, Yuhua
Chen, Zi-Jiang
Article History
Received: 21 December 2017
Accepted: 2 July 2018
First Online: 18 July 2018
Ethics approval and consent to participate
: The protocol has been approved by the institutional review board (IRB) at the Reproductive Medicine Center affiliated to Shandong University (2017 IRB approval No. 23). Informed consent will be obtained from all participants prior to enrollment.
: Not applicable.
: The authors declare that they have no competing interests.
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