Krupka, Jerzy
Aleshkevych, Pavlo http://orcid.org/0000-0002-2966-130X
Salski, Bartlomiej
Kopyt, Pawel
Pacewicz, Adam
Article History
Received: 28 February 2017
Accepted: 2 June 2017
First Online: 18 July 2017
Competing Interests
: The authors declare that they have no competing interests.