Funding for this research was provided by:
Ministerio de Economía, Industria y Competitividad, Gobierno de España (DPI2015-64571-R, FIS2017-89258-P)
Text and Data Mining valid from 2019-10-07
Received: 14 August 2019
Accepted: 30 September 2019
First Online: 7 October 2019
: The authors declare that they have no competing interests.