Janicki, L.
Kunert, G.
Sawicki, M.
Piskorska-Hommel, E.
Gas, K.
Jakiela, R.
Hommel, D.
Kudrawiec, R.
Article History
Received: 10 October 2016
Accepted: 30 December 2016
First Online: 2 February 2017
Competing interests
: The authors declare no competing financial interests.