Funding for this research was provided by:
Ministry of Education and Youth of the Czech Republic (AZV CR 16-31092A)
Text and Data Mining valid from 2019-05-08
Received: 16 July 2018
Accepted: 15 April 2019
First Online: 8 May 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in the study 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.