48 visiting now: 28 USA 
7 Germany 
3 Canada 
3 China 
2 Belgium 
2 Iran 
2 UK 
1 France 
1 Australia 
1 Austria 
1 Hong Kong 
1 Nigeria 
7 Germany 3 Canada 3 China 2 Belgium 2 Iran 2 UK 1 France 1 Australia 1 Austria 1 Hong Kong 1 Nigeria