Ivashchenko, Olena
Peplińska, Barbara
Gapiński, Jacek
Flak, Dorota
Jarek, Marcin
Załęski, Karol
Nowaczyk, Grzegorz
Pietralik, Zuzanna
Jurga, Stefan
Article History
Received: 19 October 2017
Accepted: 23 February 2018
First Online: 6 March 2018
Competing Interests
: The authors declare no competing interests.