Funding for this research was provided by:
Eesti Teadusagentuur (PSG268)
Text and Data Mining valid from 2020-03-12
Received: 13 November 2019
Accepted: 29 February 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: This study did not require official or institutional ethical approval.
: Not applicable.
: The authors declare that they have no competing interests.