- 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 26 February 2016
- Revised 13 June 2016
- Accepted 17 July 2016
- Published online 18 April 2017.
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