- Correspondence to Dr Weihong Yu, Ophthalmology, Peking Union Medical College Hospital, Beijing 100730, China; ; Professor Youxin Chen, Ophthalmology, Peking Union Medical College Hospital, Beijing, China;
- Received October 3, 2019
- Revised February 7, 2020
- Accepted February 20, 2020
- First published March 26, 2020.
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