- Correspondence to Dr Songfu Feng, Department of Ophthalmology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China;
- Received November 28, 2017
- Revised May 3, 2018
- Accepted May 30, 2018
- First published July 20, 2018.
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.