- 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 July 20, 2016
- Revised November 2, 2016
- Accepted December 5, 2016
- First published January 5, 2017.
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