Funding for this research was provided by:
Ministerstwo Nauki i Szkolnictwa Wyższego (0034/RS3/2015/53)
Received: 20 September 2018
Accepted: 6 February 2019
First Online: 15 February 2019
Ethics approval and consent to participate
: The experimental procedures and potential risks were explained to the participants, and a written informed consent was provided and signed prior to inclusion in the study. The study was conducted in accordance with the Declaration of Helsinki, and the protocol of the study was approved by the Local Bioethics Committee at the Poznan University of Medical Sciences (decision no. 769/13 of 10 October 2013).
: Not applicable.
: The authors declare no conflict of interest, financial or otherwise. The authors declare that the results of the study are presented clearly, honestly and without fabrication, falsification or inappropriate data manipulation.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.