Janowicz, Monika
Lenart, Andrzej
Article History
Received: 21 November 2017
Revised: 22 January 2018
Accepted: 27 January 2018
First Online: 7 February 2018
Compliance with ethical standards
:
: The authors declare no conflict of interest. No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the authors or any organization with the authors are associated.