Región
United States
16
France
7
Great Britain
6
Europe
4
China
3
Germany
3
India
3
Japan
3
Australia
2
Russia
2
Asia
1
Atlantic Ocean Region
1
Developing countries
1
East Asia
1
England
1
Former Yugoslav republics
1
Iran
1
Israel
1
Middle East
1
New South Wales
1
Nigeria
1
Pakistan
1
Pennsylvania
1
Pittsburgh
1
Russia (Federation)
1
Tehran
1
Ukraine
1
Verenigde Staten
1