Subject Region
United States
27
Great Britain
8
Japan
6
Europe
4
Canada
3
European Union countries
3
China
2
Ontario
2
Sri Lanka
2
Sweden
2
Taiwan
2
Africa, Sub-Saharan
1
Argentina
1
Australia
1
Austria
1
Brno
1
Buenos Aires
1
Caribbean Area
1
Czech Republic
1
Developing countries
1
France
1
Ho Chi Minh City
1
India
1
Korea (South)
1
New York
1
New York (State)
1
Vietnam
1