Szpechcinski, A
Chorostowska-Wynimko, J
Struniawski, R
Kupis, W
Rudzinski, P
Langfort, R
Puscinska, E
Bielen, P
Sliwinski, P
Orlowski, T
Article History
Received: 1 February 2015
Revised: 14 May 2015
Accepted: 26 May 2015
First Online: 30 June 2015
Competing interests
: The authors declare no conflict of interest.