Betekhtin, Alexander http://orcid.org/0000-0001-6146-1669
Pinski, Artur
Milewska-Hendel, Anna
Kurczynska, Ewa
Hasterok, Robert
Funding for this research was provided by:
University of Silesia in Katowice
Article History
Received: 9 August 2018
Accepted: 7 February 2019
First Online: 14 February 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The authors declare that the study was carried out according to the accepted professional conduct. However, no ethical approval was needed for the study as it did not involve the use of animals or human subjects.