Funding for this research was provided by:
Ministry of Science and Higher Education in Poland (N/ST/MN/18/002/3310)
Received: 20 June 2019
Accepted: 16 May 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: The study protocol and informed consent procedure were approved by the Bioethics Committee of the Medical University in Bialystok, Poland (R-I-002/365/2017). The investigation was carried out in accordance with the Declaration of Helsinki. Each participant gave written informed consent prior to all study procedures.
: Not applicable.
: The authors declare that they have no competing interests.