The Charité – Universitätsmedizin Berlin is Europe's largest University clinic, affiliated with both Humboldt University and Freie Universität Berlin. With numerous Collaborative Research Centers (CRC) of the Deutsche Forschungsgemeinschaft, including three Nobel Prize Laureates working as research fellows in the Einstein Foundation, Charité is one of Germany's most research-intensive medical institutions. For the past five years, Charité has been ranked by Focus as the best of over 1000 hospitals in Germany. More than half of all German Nobel Prize winners in Physiology or Medicine, including Emil von Behring, Robert Koch, and Paul Ehrlich came from the Charité. Its medical school is one of the most prestigious and competitive in Germany with admission rates lower than 5%.