. 2021 Apr 28;9:666453. doi: 10.3389/fpubh.2021.666453
Copyright © 2021 Maresova, Rezny, Peter, Hajek and Lefley.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Figure 1.
Certification costs.