Funding for this research was provided by:
Ministerio de Economía, Industria y Competitividad, Gobierno de España (BES-2015-072438)
European Regional Development Fund (FIS2017-87519-P)
Text and Data Mining valid from 2019-06-07
Received: 25 January 2019
Accepted: 30 May 2019
First Online: 7 June 2019
: The authors declare that they have no competing interests.