Olczak, Mieszko
Chutorański, Dominik
Kwiatkowska, Magdalena
Samojłowicz, Dorota
Tarka, Sylwia
Wierzba-Bobrowicz, Teresa
Article History
Accepted: 4 December 2017
First Online: 18 January 2018
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.
: For this type of study formal consent is not required.
: None.
: None.