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Authors
Jia, Lu
Liu, Qing
Hou, Huiqing
Guo, Guangli
Zhang, Ting
Fan, Songli
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Article History
Received: 12 May 2020
Accepted: 15 October 2020
First Online: 5 November 2020
Ethics approval and consent to participate
: All participants consented in writing to participation, and the above protocols were approved by the ethics committee of Hebei Women and Children’s Health Center.
: Not Applicable.
: The authors declare that they have no competing interest.
