Article Information
vol. 69 no. 4 878-883
PubMed
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History
- Accepted October 27, 2020
- Published online April 1, 2021.
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- Previous version (December 24, 2020 - 06:56).
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Copyright & Usage
© American Federation for Medical Research 2021. No commercial re-use. See rights and permissions. Published by BMJ.
Author Information
- 1 Obstetrics and Gynecology, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
- 2 Department of Obstetrics and Gynecology, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
- Correspondence to Dr Jianhua Zheng, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China; kelanbai5{at}163.com