Text and Data Mining valid from 2019-01-08
Received: 17 October 2018
Accepted: 26 December 2018
First Online: 8 January 2019
Ethics approval and consent to participate
: This original paper was approved by the local ethics committee of Wroclaw Medical University. All participants consented to participate in the study and the written informed consent was obtained from each subject.
: Not applicable.
: The authors declare that they have no competing interests.
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