31 visiting now: 15 USA 
4 India 
4 China 
3 Singapore 
1 Germany 
1 Taiwan 
1 Argentina 
1 Hong Kong 
1 Switzerland 
4 India 4 China 3 Singapore 1 Germany 1 Taiwan 1 Argentina 1 Hong Kong 1 Switzerland 4 India 4 China 3 Singapore 1 Germany 1 Taiwan 1 Argentina 1 Hong Kong 1 Switzerland