Funding for this research was provided by:
European Regional Development Fund
Text and Data Mining valid from 2018-10-19
Received: 27 September 2018
Accepted: 29 September 2018
First Online: 19 October 2018
: All procedures were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no competing interest.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.