38 visiting now: 13 China 
12 USA 
4 Singapore 
3 India 
2 Germany 
1 Netherlands 
1 Canada 
1 Iran 
1 Japan 
12 USA 4 Singapore 3 India 2 Germany 1 Netherlands 1 Canada 1 Iran 1 Japan 12 USA 4 Singapore 3 India 2 Germany 1 Netherlands 1 Canada 1 Iran 1 Japan