- Correspondence to Dr Xuehan Qian, Department of Ophthalmology, Tianjin Medical University Eye Hospital, 251 Fukang Road, Nankai District, Tianjin 300384, China;
- Received October 28, 2016
- Revised January 31, 2017
- Accepted February 6, 2017
- First published March 3, 2017.
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.