- 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 7 March 2014
- Revised 7 May 2014
- Accepted 3 June 2014
- Published in print 1 March 2015.
- Published online 18 February 2015.
- Published first 1 July 2014.
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