Koperwas, Kajetan
Adrjanowicz, Karolina
Wojnarowska, Zaneta
Jedrzejowska, Agnieszka
Knapik, Justyna
Paluch, Marian
Article History
Received: 31 August 2016
Accepted: 24 October 2016
First Online: 24 November 2016
Competing interests
: The authors declare no competing financial interests.