Frankfurt am Main, Hessen, Germany
Madrid, Community of Madrid, Spain
Freiburg im Breisgau, Baden-Wuerttemberg, Germany
Freiburg, Baden-Württemberg, Germany
Cologne, North Rhine-Westphalia, Germany
Karlsruhe, Baden-Württemberg, Germany
Turku, Finland
Ihringen, Baden-Württemberg, Germany
Leiden, South Holland, Netherlands