Krajewska, Joanna http://orcid.org/0000-0002-7919-7816
Krajewski, Wojciech
Zub, Krzysztof
ZatoĊski, Tomasz
Article History
Received: 30 March 2020
Accepted: 6 April 2020
First Online: 18 April 2020
Compliance with ethical standards
: All the research included in this manuscript meet the ethical guidelines, including adherence to the legal requirements of the study country. The study protocol complied with the 1964 Helsinki declaration and its later amendments. I confirm that the manuscript has not been published or submitted for publication to any other journal.
: The authors declare that they have no conflicts of interests.
: Not applicable.