Funding for this research was provided by:
Śląski Uniwersytet Medyczny (KNW-1-195/K/6/K)
Article History
First Online: 17 June 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: Informed consent was obtained from all individual participants included in the study.
: All procedures performed in studies involving human participants were conducted 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.