- Correspondence to Professor Saeed Akhtar, Cornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, PO Box 10219, Riyadh 11433, Saudi Arabia;
- Received 22 October 2016
- Revised 2 January 2017
- Accepted 28 February 2017
- Published online 17 April 2017.
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