Funding for this research was provided by:
Uniwersytet Medyczny im. Piastów Slaskich we Wroclawiu (Pbmn140)
Received: 2 August 2016
Accepted: 24 January 2018
First Online: 30 January 2018
Ethics approval and consent to participate
: Research was carried out in compliance with theExternalRef removed. Approval of the Bioethical Committee of the Wroclaw Medical University was obtained for the study (ethical approval reference number: KB 572/2013). Written informed consent for the study was obtained from all the participants.
: Not applicable.
: The authors declare that they have no competing interests.
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