Funding for this research was provided by:
Śląski Uniwersytet Medyczny (KNW-1-156/N/3/0)
Article History
Received: 22 October 2017
Accepted: 6 November 2018
First Online: 23 November 2018
Compliance with ethical standards
:
: All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.
: The research was performed under the Medical University of Silesia in Katowice Bioethical Commission agreement—no. KNW/0022/KB1/141/11.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (Bioethical Commission of the Medical University of Silesia in Katowice) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: This article does not contain any studies with animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.