- Correspondence to Dr Colin S H Tan, National Healthcare Group Eye Institute, Tan Tock Seng Hospital, 11 Jalan Tan Tock Seng, Singapore 308433, Singapore;
- Received 1 April 2014
- Revised 16 July 2014
- Accepted 9 September 2014
- Published in print 1 March 2015.
- Published online 18 February 2015.
- Published first 1 October 2014.
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