- Correspondence to Dr Kanmin Xue, NIHR Academic Clinical Lecturer, Nuffield Laboratory of Ophthalmology, Level 6 West Wing, John Radcliffe Hospital, Headley Way, Oxford OX3 9DU, UK;
- Received March 11, 2016
- Revised July 15, 2016
- Accepted July 26, 2016
- First published August 16, 2016.
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.