Olivares-García, V
Torre-Villalvazo, I
Velázquez-Villegas, L
Alemán, G
Lara, N
López-Romero, P
Torres, N
Tovar, A R
Díaz-Villaseñor, A
Article History
Received: 26 May 2015
Revised: 18 September 2015
Accepted: 4 October 2015
First Online: 30 November 2015
Competing interests
: The authors declare no conflict of interest.