- Correspondence to Dr Yifeng Wang, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China; ; Dr Yanwei Sha, Women and Children's Hospital & School of Medicine, Xiamen University, Xiamen, Fujian, China; ; Dr Vladimir Isachenko, Department of Obstetrics and Gynecology, Medical Faculty, University of Cologne, Cologne, North Rhine-Westphalia, Germany;
- Received August 5, 2021
- Accepted April 14, 2022
- First published May 9, 2022.
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