- Correspondence to Dr Yan-Hong Huang, Department of Ophthalmology, Shenyang Women’sand Children’s Hospital, Shenyang 110011, China; ; Dr Yu-Hong Zhao, Department of Clinical Epidemiology, Clinical ResearchCenter, Shengjing Hospital of China Medical University, Shenyang 110004, China; ; Dr Qi-Jun Wu, Department of Clinical Epidemiology, Shengjing Hospital of China Medical University, Shenyang 110004, China;
- Received January 20, 2020
- Revised June 10, 2020
- Accepted June 22, 2020
- First published July 31, 2020.
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