- Correspondence to Dr Ryo Obata, Ophthalmology, Tokyo Daigaku Daigakuin Igakukei Kenkyuka Igakubu, Bunkyo-ku, Tokyo 113-8655, Japan;
- Received January 19, 2021
- Revised March 24, 2021
- Accepted April 14, 2021
- First published May 6, 2021.
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