Radwan, M
Jurewicz, J
Merecz-Kot, D
Sobala, W
Radwan, P
Bochenek, M
Hanke, W
Article History
Received: 23 December 2014
Revised: 12 November 2015
Accepted: 31 January 2016
First Online: 14 April 2016
Competing interests
: The authors declare no conflict of interest.