30 visiting now: 12 China 
7 USA 
3 Singapore 
2 Korea 
2 Germany 
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1 Brazil 
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7 USA 3 Singapore 2 Korea 2 Germany 1 Hong Kong 1 Brazil 1 Russia 1 Belgium 7 USA 3 Singapore 2 Korea 2 Germany 1 Hong Kong 1 Brazil 1 Russia 1 Belgium