Funding for this research was provided by:
Gobierno de Extremadura (PRI08B130)
Text and Data Mining valid from 2018-09-07
Received: 24 May 2018
Accepted: 30 August 2018
First Online: 7 September 2018
Compliance with Ethical Standards
: This research was carried out under the Helsinki Declaration ethic guidelines, updated at the World Medical Assembly in Seoul in 2008, for research with human subjects. The experimental design was approved by the Ethic Committee of University of Extremadura.
: The authors declare that they have no conflict of interests.