Sobon, Grzegorz
Duzynska, Anna
Świniarski, Michał
Judek, Jarosław
Sotor, Jarosław
Zdrojek, Mariusz
Article History
Received: 17 October 2016
Accepted: 28 February 2017
First Online: 3 April 2017
Competing interests
: The authors declare no competing financial interests.