Wei, Minling
Yang, Yang
Jin, Xiaoying
Yang, Jingyan
Huang, Dong
Zhang, Songying http://orcid.org/0000-0001-8044-6237
Funding for this research was provided by:
Key Research and Development Program of Zhejiang Province grant (2017C03022)
Article History
Received: 23 March 2020
Accepted: 17 October 2020
First Online: 2 January 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was approved by the Ethics Committee of Sir Run Run Shaw Hospital (Ethics Approval Number: 20200302-34).
: All patients had signed the informed consent statement for cerclage before the operation. The study was exempted from signing the informed consent for clinical trials because of the characteristic of the retrospective study.