Funding for this research was provided by:
Narodowym Centrum Nauki (N N404 597640)
Gdański Uniwersytet Medyczny (ST-12)
Text and Data Mining valid from 2018-11-28
Received: 7 August 2018
Accepted: 2 November 2018
First Online: 28 November 2018
Ethics approval and consent to participate
: All volunteers signed informed consent and study received approval from Ethical Committee of the Medical University of Gdańsk, Poland (225/2010).
: Not applicable.
: The authors declare that they have no competing interests.
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