Funding for this research was provided by:
Hungarian Scientific Research Fund (K 108974)
Seventh Framework Programme (294332)
Horizon 2020 Framework Programme (648693)
Text and Data Mining valid from 2018-05-15
Received: 4 January 2018
Accepted: 13 April 2018
First Online: 15 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.