On this website, Piwik, an open source web analytics tool (http://en.piwik.org) collects and stores data for marketing and optimization purposes. From this data, usage profiles can be created under a pseudonym. Cookies can be used. Cookies are small text files that are stored locally in the cache of the web browser's web browser. Cookies enable recognition of the Internet browser. The data collected with Piwik will not be used to personally identify the visitors of this website, nor will it be combined with personal data about the bearer of the pseudonym.