Zajkowicz, A
Butkiewicz, D
Drosik, A
Giglok, M
SuwiĆski, R
Rusin, M
Article History
Received: 20 October 2014
Revised: 28 January 2015
Accepted: 1 February 2015
First Online: 5 March 2015
Competing interests
: The authors declare no conflict of interest.