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Authors
Liang, H. https://orcid.org/0000-0002-9245-9462
Li, G. L.
Liu, J.
Fu, M.
Huang, H.
Zhao, K.
Wei, Y.
Xiao, J.
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Article History
Received: 8 February 2020
Accepted: 28 May 2020
First Online: 8 June 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by Ethical Committee of Xuzhou Maternity and Child Health Care Hospital and conducted in accordance with the ethical standards.
: Yes.
