Funding for this research was provided by:
Gdanski Uniwersytet Medyczny (02-110/07/320)
Received: 23 November 2017
Accepted: 1 October 2018
First Online: 10 October 2018
Ethics approval and consent to participate
: The study was approved by the Independent Bioethics Committee at Medical University in Gdansk (approval NKBBN/508/2017).
: The manuscript does not contain any individual person’s data in any form.
: The authors declare that they have no competing interests.
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