Text and Data Mining valid from 2019-05-17
Received: 10 August 2017
Accepted: 30 April 2019
First Online: 17 May 2019
Ethics approval and consent to participate
: The study was conducted according to the Declaration of Helsinki and with the approval of the Bioethics Committee of the Poznań University of Medical Sciences (reference number 949/14). Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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