- Correspondence to Dr Tsutomu Miyamoto, Obstetrics and Gynecology, Shinshu University Graduate School of Medicine School of Medicine, Matsumoto 390-8621, Nagano, Japan;
- Received May 12, 2020
- Revision received August 7, 2020
- Accepted August 11, 2020
- First published September 3, 2020.
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