Siegburg, North Rhine-Westphalia, Germany
Düsseldorf, Nordrhein-Westfalen, Germany
Köln, Nordrhein-Westfalen, Germany
Wesseling, North Rhine-Westphalia, Germany
Hannover, Niedersachsen, Germany
Berlin, Berlin, Germany
The Hague, South Holland, Netherlands
Vechta, Lower Saxony, Germany
Aberdeen, Scotland, United Kingdom of Great Britain and Northern Ireland
Leuven, Flanders, Belgium
Amsterdam, Noord-Holland, Netherlands
