Funding for this research was provided by:
Secretaría de Estado de Investigación, Desarrollo e Innovación (AGL2014-53822-C2-1-R)
Text and Data Mining valid from 2019-12-01
Received: 28 March 2019
Accepted: 5 November 2019
First Online: 13 December 2019
Compliance with ethical standards
: The authors declare that they have no conflicts of interest.