18 visiting now: 7 USA 
3 China 
2 Singapore 
2 India 
1 Germany 
1 Taiwan 
1 Denmark 
1 Canada 
3 China 2 Singapore 2 India 1 Germany 1 Taiwan 1 Denmark 1 Canada 3 China 2 Singapore 2 India 1 Germany 1 Taiwan 1 Denmark 1 Canada