- Correspondence to Dr Enrique O Graue-Hernández, Department of Cornea and Refractive Surgery, Instituto de Oftalmología “Conde de Valenciana”, Chimalpopoca 14, Cuauhtémoc, Mexico City 06800, Mexico;
- Received February 26, 2016
- Revised June 13, 2016
- Accepted July 17, 2016
- First published August 8, 2016.
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