Funding for this research was provided by:
Eesti Teadusagentuur (PUT1669)
European Regional Development Fund (2014-2020.4.01.15-0012)
Narodowym Centrum Nauki (UMO-2014/13/B/NZ3/02393, UMO-2014/15/B/NZ5/01539)
Received: 28 August 2019
Accepted: 18 November 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Jagiellonian University Medical College and by the Research Ethics Committee of the University of Tartu. Each participant provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.