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Authors
Cheng, Yan
Chen, Jiayuan
Li, Tingting
Pei, Jiangnan
Fan, Yongfang
He, Mulan
Liu, Shuangping
Liu, Junxiu
Zhang, Qingying
Cheng, Haidong
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (81871184, 81471469)
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Article History
Received: 30 May 2022
Accepted: 25 October 2022
First Online: 5 November 2022
Declarations
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: The study was conducted in accordance with the Declaration of Helsinki, and approved by the Ethics Committee of the Obstetrics & Gynecology Hospital of Fudan University ([2015] grant no. 41). Data were extracted from medical records, and the consent to participate was unavailable due to the retrospective design of the study and difficulty in reconnection; however, the private information was well protected.
: Not applicable.
: The authors declare that they have no competing interests.
