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Authors
Lin, Si-Li
Duan, Hua
Wang, Sha
Li, Jin-Jiao
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Article History
Received: 12 June 2019
Accepted: 27 September 2019
First Online: 7 January 2020
Compliance with Ethical Standards
: This study was strictly carried out in accordance with the principles of the Declaration of Helsinki and approved by the Ethics Committee for Clinical Research of Beijing Obstetrics and Gynecology Hospital, Capital Medical University (approval no. 2016-KY-012). All participants signed informed consent before surgery.
: The authors declare that they have no conflicts of interest.
