- Correspondence to María Fernanda Martínez-Salazar, Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional, CP 11350 Ciudad de México, México;
- Received September 15, 2016
- Revised January 4, 2017
- Accepted January 16, 2017
- First published March 16, 2017.
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