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Authors
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Funding
Funding for this research was provided by:
Shanghai Municipal Commission of Health and Family Planning (201540224)
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Article History
Received: 20 January 2018
Accepted: 11 June 2018
First Online: 26 June 2018
Ethics approval and consent to participate
: This study was approved by the ethics committee of Obstetrics and Gynecology Hospital of Fudan University (OGHFU) and the approval number is fck2016–21.
: Not applicable.
: The authors declare that they have no competing interests.
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