Funding for this research was provided by:
National Science Centre of Poland (DEC-2013/11/N/HS3/04889)
Received: 27 April 2019
Accepted: 10 December 2019
First Online: 8 January 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The funders had no role in study, design, data collection and analysis, decision to publish, or preparation of the manuscript.