Country

Number of references

%

China

13

28.3

Turkey

8

17.4

America

4

8.7

Japan

3

6.5

Canada

2

4.3

Iran

2

4.3

Netherlands

2

4.3

Spain

2

4.3

Australia

1

2.2

Belgium

1

2.2

Brazil

1

2.2

Israel

1

2.2

Italy

1

2.2

Singapore

1

2.2

Sri Lanka

1

2.2

Sweden

1

2.2

46

100