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Authors
Xia, Mingjing http://orcid.org/0000-0002-3099-5382
Yang, Xinhong
Fu, Jing
Teng, Zhenjuan
Lv, Yan
Yu, Lixia
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Article History
Received: 16 April 2020
Accepted: 28 October 2020
First Online: 16 November 2020
Ethics approval and consent to participate
: Ethical approval was gained from the Weihai Maternal and Child Health Hospital, China. (batch number: 2016-LW-26)). Written informed consent was obtained from all of the participants .
: Not applicable.
: The authors declare that they have no competing interests.
