Funding for this research was provided by:
Generalitat de Catalunya (SGR-661/2017)
Ministerio de Economía y Competitividad (AYA2017-86274-P)
Text and Data Mining valid from 2018-11-16
Received: 28 May 2018
Accepted: 8 November 2018
First Online: 16 November 2018
: The authors declare that they have no competing interests.