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Article History

Received: 1 June 2018

Accepted: 2 May 2019

First Online: 16 May 2019

Ethics approval and consent to participate

: All procedures performed in studies involving human participants were 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. Institutional Review Board approved the study protocol (Ethics and Supervision Commission for research on humans and animals at Central Clinical Hospital of the Ministry of Interior and Administration in Warsaw; approval number 63/2013 issued July 1, 2013). Written informed consent was obtained from all individual participants included in the study.

: Not applicable.

: The authors declare that they have no competing interests.

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