- Correspondence to Professor Nathan Congdon, State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Guangzhou 510060, China, or TREE Centre, Centre for Public Health, Queen's University Belfast, Belfast BT12 6AB, UK;
- Received January 5, 2016
- Revised March 5, 2016
- Accepted March 19, 2016
- First published April 12, 2016.
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