- Correspondence to Dr Cheng-Yu Cheng, Academic Medicine Research Institute, Duke-NUS Medical School, Head, Ocular Epidemiology Research Group & Statistics Unit, Singapore Eye Research Institute, 20 College Road, The Academia, Level 6, Discovery Tower, Singapore 169856, Singapore;
- Received 20 July 2016
- Revised 2 November 2016
- Accepted 5 December 2016
- Published online 5 January 2017.
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