- Correspondence to Dr David Vega-Morales. Hospital General de Zona No. 17, Instituto Mexicano del Seguro Social, Fortunato Lozano 2627 Benito Juárez, C.P. 64218 Monterrey, México;
- Received November 10, 2013
- Accepted November 21, 2013
- First published December 13, 2013.
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