Estévez-González, M D
Santana del Pino, A
Henríquez-Sánchez, P
Peña-Quintana, L
Saavedra-Santana, P
Article History
Received: 12 June 2015
Revised: 22 September 2015
Accepted: 1 October 2015
First Online: 26 October 2015
Competing interests
: The authors declare no conflict of interest.