Funding for this research was provided by:
Narodowe Centrum Nauki (2017/01/X/NZ9/01707)
Text and Data Mining valid from 2019-10-15
Received: 16 September 2019
Accepted: 11 October 2019
First Online: 15 October 2019
Ethics approval and consent to participate
: Not applicable.
: The authors have consented for publication.
: The authors declare that they have no competing interests.