Region
United States --
6
United States
4
China
2
China --
2
Africa, Sub-Saharan
1
Africa, Sub-Saharan --
1
Canada
1
Developing countries
1
Developing countries --
1
Europe, Eastern
1
Great Britain
1
India
1
India --
1
Israel
1
Philippines
1
Philippinese --
1
Russia
1
Russia --
1
Soviet Union --
1
Washington (D.C.)
1
Washington (D.C.) --
1