Tianjin, China
2011
Guangzhou, China
2009
San Francisco, California, USA
2017
Berlin, Germany
2006
Leipzig, Germany
2003
Hamburg, Germany
2003
Heilbronn, Germany
2001
Vienna, Austria
2000
Berlin, Germany
1999
Berlin-Spandau, Germany
1998
Stuttgart, Germany
1998
Ulm, Germany
1993
