Funding for this research was provided by:
European Union's Seventh Framework Programme (607433)
Text and Data Mining valid from 2018-08-29
Received: 7 March 2018
Accepted: 15 May 2018
First Online: 29 August 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.