- Correspondence to Professor Bahaa Hasan Abdulhalim, Department of Ophthalmology, Faculty of Medicine, Zagazig University, Zagazig, Egypt;
- Received 11 March 2014
- Revised 19 May 2014
- Accepted 6 July 2014
- Published in print 1 January 2015.
- Published online 15 December 2014.
- Published first 22 July 2014.
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