Table 1 Total citations

United States

160802

United Kingdom

47533

Brazil

25876

France

21301

Germany

19619

Canada

18496

Switzerland

14069

Spain

10219

India

9910

Italy

7214

Australia

6812

Japan

6742

Netherlands

6705

Israel

6148

Venezuela

5037

Belgium

4895

Kenya

3417

Sudan

3417

Sweden

2794

Denmark

2657

Colombia

2424

Argentina

1954

Iran

1370

Portugal

1356

Mexico

1239