Fregel, Rosa
Cabrera, Vicente M
Larruga, José M
Hernández, Juan C
Gámez, Alejandro
Pestano, Jose J
Arnay, Matilde
González, Ana M
Article History
Received: 12 May 2014
Revised: 8 September 2014
Accepted: 10 October 2014
First Online: 19 November 2014
Competing interests
: The authors declare no conflict of interest.