Ptok, Andrzej
Kapcia, Konrad J.
Cichy, Agnieszka
Oleś, Andrzej M.
Piekarz, Przemysław
Article History
Received: 13 October 2016
Accepted: 4 January 2017
First Online: 6 February 2017
Competing interests
: The authors declare no competing financial interests.