Düsseldorf, North Rhine-Westphalia, Germany
Cologne, North Rhine-Westphalia, Germany
Chongqing, Chongqing, China
Upper Austria, Austria
Guangzhou, Guangdong, China
Huerth, North Rhine-Westphalia, Germany
Eschweiler, North Rhine-Westphalia, Germany
Würzburg, Bavaria, Germany
Köln, Nordrhein-Westfalen, Germany