- Correspondence to Dr Ying Shen, Department of Obstetrics/Gynecology, Key Laboratory of Obstetric, Gynecologic and Pediatric Diseases and Birth Defects of Ministry of Education, Sichuan University West China Second University Hospital, Chengdu, China;
- Received December 22, 2021
- Accepted May 11, 2022
- First published June 2, 2022.
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