The images shown in the section "free pictures" are available under theCreative Commons license "Attribution-No Derivative Works" . The illustrations can be used free of charge also for commercial purposes. However, the illustrations are not free of rights, the usage is permitted under the following conditions:
You must attribute "www.MedicalGraphics.de" as author and specify the license (CC BY-ND 4.0).
Modifications of the illustrations is not permitted, including the removal of our logo/URL.
If you use the illustration onliine we would appreciate a link to our website "www.medicalgraphics.de".