Region
United States
10
United States --
6
Europe
3
Developing countries
2
Europe --
2
Southeast Asia
2
Africa, Northeast
1
Asia, Southeastern
1
Asia, Southeastern --
1
Canada
1
Caucasus, Northern
1
Central America
1
East Asia --
1
Europe, Central
1
Europe, Eastern
1
Korea (North)
1
Korea (North) --
1
Korea (South)
1
Korea (South) --
1
Middle East --
1
Russia(Federation) --
1
Ukraine --
1
United states --
1