Funding for this research was provided by:
European Research Council (ERC-2012-AdG-320737)
Ministerio de Economía y Competitividad (CTM2014-51985-R)
Text and Data Mining valid from 2018-05-18
Received: 19 December 2017
Accepted: 25 April 2018
First Online: 18 May 2018
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.