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Funding for this research was provided by:
Ministerstwo Nauki i Szkolnictwa Wyższego (PBZ-MEIN-9/2/2006)
Śląski Uniwersytet Medyczny (KNW-1-061/N/4/0)
Article History
Received: 28 November 2017
Accepted: 26 February 2018
First Online: 9 March 2018
Compliance with ethical standards
:
: On behalf of all authors, the corresponding author states that there is no conflict of interest. All authors have read and approved the final manuscript.
: The study was approved by the Bioethics Committee of Medical University of Silesia (KNW/0022/KB1/38/II/08/10; KNW-6501-38/I/08).
: All participants signed informed consent.