Updates are available Correction dated 2021-10-09
Click to view Correction: https://doi.org/10.1186/s12884-021-04159-9
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Authors
Hu, Qiaofei
Li, Changdong
Luo, Lanrong
Li, Jian
Zhang, Xiaofeng
Chen, Suwen
Yang, Xiaokui
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Article History
Received: 30 March 2021
Accepted: 24 July 2021
First Online: 18 August 2021
Change Date: 9 October 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/s12884-021-04159-9
Declarations
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: This study was approved by the Human Ethics Committees of Beijing Obstetrics and Gynecology Hospital, Capital Medical University. All participants provided informed consent to participate in the study and all methods were carried out in accordance with relevant guidelines and regulations.
: All participants provided consent to the publication of this study.
: The authors declare that they have no competing interests.
