Funding for this research was provided by:
Narodowe Centrum Nauki (DEC-2011/03/N/ST8/04014)
Article History
Received: 18 June 2018
Revised: 2 October 2018
Accepted: 11 October 2018
First Online: 7 November 2018
Compliance with Ethical Standards
:
: Wojciech PiÄ…tkowski declares that he has no conflict of interest. Dorota Antos declares that she has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.