Funding for this research was provided by:
Ministerio de Economía y Competitividad (DPI2013-47944-C4-1-R)
Text and Data Mining valid from 2019-11-06
Received: 21 September 2018
Accepted: 10 September 2019
First Online: 6 November 2019
Ethics approval and consent to participate
: The study was approved by the Human Ethics Committee of the Rey Juan Carlos University.
: Consent to publish was obtained from all the participants.
: The authors declare that they have no competing interests.