Burchart-Korol, Dorota
Pustejovska, Pavlina
Blaut, Agata
Jursova, Simona
Korol, Jerzy
Article History
Received: 12 October 2017
Revised: 8 February 2018
Accepted: 12 February 2018
First Online: 19 February 2018
Compliance with ethical standards
: This research did not involve human or animal participants.
: The authors declare that they have no conflict of interest.