Sawicki, Jakub
Plášek, Vítězslav
Ochyra, Ryszard
Szczecińska, Monika
Ślipiko, Monika
Myszczyński, Kamil
Kulik, Tomasz
Article History
Received: 8 December 2016
Accepted: 22 May 2017
First Online: 30 June 2017
Competing Interests
: The authors declare that they have no competing interests.