Funding for this research was provided by:
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal (K124351, K115624, 2017-1.2.1-NKP-2017-00001, PD120975)
Magyar Tudományos Akadémia (Janos Bolyai Research Scholarship)
Text and Data Mining valid from 2020-01-15
Received: 30 November 2018
Accepted: 8 January 2020
First Online: 15 January 2020
: The authors declare that they have no competing interests.