"Wirbelkörperhämangiom" (https://kmed.uni-giessen.de/ilias/goto.php?target=pg_46171_167119) by Prof. Hilke Vorwerk (https://www.youtube.com/channel/UCpBHT7vSwpHdOQdVJ2IYdGA) can be reused under the CC BY-SA license (https://creativecommons.org/licenses/by-sa/4.0/). The original version of the graphik „Vertebral Hemangioma“ by Wikipedia (https://commons.wikimedia.org/wiki/File:Vertebral_Hemangioma.jpg) is lis made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.