Progressio OG is the official developer of KHS Wissen which can be found in the Medical tools category. The tool was downloaded and installed by over 100 users and its most recent stable release was on Jan 10, 2018. On Google Play, this application is rated 4.3 by its users.
It's free to get the installer of KHS Wissen, also, you can have a look at users' reviews on Droid Informer. The app runs on Android 5.0 and higher. The download of the app doesn't contain viruses or any kind of malware.