- Correspondence to Dr Tien Y Wong, Singapore Eye Research Institute, Singapore National Eye Centre, National University of Singapore, 11 Third Hospital Avenue, Singapore 168751, Singapore;
- Received March 7, 2014
- Revised May 7, 2014
- Accepted June 3, 2014
- First published July 1, 2014.
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.