50 visiting now: 29 USA 
9 Singapore 
5 Canada 
3 UK 
3 China 
2 Brazil 
1 Iran 
1 Belgium 
1 Germany 
9 Singapore 5 Canada 3 UK 3 China 2 Brazil 1 Iran 1 Belgium 1 Germany 9 Singapore 5 Canada 3 UK 3 China 2 Brazil 1 Iran 1 Belgium 1 Germany