Funding for this research was provided by:
Agentúra Ministerstva Školstva, Vedy, Výskumu a Športu SR (1/0380/18, 1/0199/17)
Russian Science Support Foundation (Grant 08-08)
Text and Data Mining valid from 2019-05-02
Received: 25 March 2019
Accepted: 23 April 2019
First Online: 2 May 2019
Compliance with ethical standards
: All authors declare no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.