Cookies are small files, which enable us to save specific, individual data about the device used to access the website (e.g. PC, smartphone, or similar). On the one hand, they serve to improve the usability of the website for the users (e.g. through saving login data). On the other hand, they serve to gather statistical data about the use of the website, which can be analyzed in order to improve its ease of use. The users can influence the use of cookies. Most browsers have a feature which can restrict or completely prevent the use of cookies. We do, however, point out, that the use and especially the usability of the website are restricted when cookies are disabled.