Funding for this research was provided by:
Ministerio de Economía, Industria y Competitividad, Gobierno de España (MTM2013-43014-P)
Agencia Estatal de Investigación (MTM2016-75140-P)
Text and Data Mining valid from 2020-02-28
Received: 12 November 2019
Accepted: 19 February 2020
First Online: 28 February 2020
: The authors declare that they have no competing interests.