In the published article, there was an error regarding the affiliation(s) for Yefang Zhao. As well as having affiliation 1, they should also have 2 Department of Obstetrics, Xingtai People’s Hospital, Affiliated Hospital of Hebei Medical University, Xingtai, Hebei, China
The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.
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