Dobrowolski, Piotr
Prejbisz, Aleksander
Klisiewicz, Anna
Florczak, Elżbieta
Rybicka, Justyna
Januszewicz, Andrzej
Hoffman, Piotr
Article History
Received: 19 October 2014
Revised: 7 February 2015
Accepted: 20 February 2015
First Online: 19 March 2015
Competing interests
: The authors declare no conflict of interest.