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Authors
Yu, Dafang
Zhang, Lihua
Yang, Shimin
Chen, Qing
Li, Zhongliang
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Article History
Received: 8 April 2021
Accepted: 29 August 2021
First Online: 5 October 2021
Declarations
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: Ethical approval was approved by the Academic Committee of Jinan Maternity and Child Care Hospital Affiliated to Shandong First Medical University and the academic committee have granted permission to conduct the studyAll methods were carried out in accordance with relevant guidelines and regulations under Ethics approval and consent to participate. The data used in this study was anonymised before its use.
: Not Applicable.
: The authors declare that they have no competing interests.
