- Correspondence to Dr Alejandro Tello, Centro Oftalmológico Virgilio Galvis, Centro Médico Ardila Lülle, Torre A, Piso 3, Módulo 7. Floridablanca, Santander, Colombia;
- Published in print 1 September 2012.
- Published online 31 August 2012.
- Published first 4 April 2012.
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