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Authors
Li, Lijun
Cui, Hongyan
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Article History
Received: 12 August 2020
Accepted: 15 March 2021
First Online: 19 May 2021
Declarations
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: This study passed the ethical review of the medical ethics committee of Tianjin central hospital of gynecology obstetrics (170093), and all patients had signed the written informed consents.
: Not applicable.
: The authors declare that they have no competing interests.
