- Correspondence to Dr Kwadwo Owusu Akuffo, Macular Pigment Research Group, Vision Research Centre, Waterford Institute of Technology, West Campus, Carriganore, Waterford X91 K236, Ireland;
- Received January 20, 2016
- Revised March 11, 2016
- Accepted March 15, 2016
- First published April 18, 2016.
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