Piętka, Sławomir
Sotnik, Agata
Damszel, Marta
Sierota, Zbigniew
Article History
Received: 10 August 2017
Accepted: 7 December 2017
First Online: 13 March 2018
Compliance with ethical standards
:
: All procedures involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.