Tederko, P
Besowski, T
Jakubiak, K
Łyp, M
Bobecka-Wesołowska, K
Kiwerski, J
Article History
Received: 3 December 2013
Revised: 4 December 2014
Accepted: 10 December 2014
First Online: 20 January 2015
Competing interests
: The authors declare no conflict of interest.