- Correspondence to Dr Wenyong Huang, Department of Preventive Ophthalmology, Zhongshan Ophthalmic Center, Guangzhou 510060, China;
- Received October 24, 2019
- Revised January 31, 2020
- Accepted February 10, 2020
- First published February 25, 2020.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.