Funding for this research was provided by:
Hospital Scientific Research Fund (SDFEYGJ1708)
Jiangsu Province Maternal and Child Health Key Talent Project (FRC201714)
Received: 21 February 2020
Accepted: 26 June 2020
First Online: 31 July 2020
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: All authors consent to publication.
: The authors declared they have no competing interests in this work.