Droździk, Marek
Kaczmarek, Maciej
Malinowski, Damian
Broś, Urszula
Kazienko, Anna
Kurzawa, Rafał
Kurzawski, Mateusz
Article History
Received: 14 July 2015
Accepted: 26 October 2015
First Online: 27 November 2015
Competing interests
: The authors declare no competing financial interests.