editorial . 2021 Dec 31;28(6):801–803. doi: 10.5603/CJ.2021.0140
Copyright © 2021 Via Medica
This article is available in open access under Creative Common Attribution-Non-Commercial-No Derivatives 4.0 International (CC BY-NC-ND 4.0) license, allowing to download articles and share them with others as long as they credit the authors and the publisher, but without permission to change them in any way or use them commercially.