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The top 10 contributing countries.
| County | Number of publications (% of total) | Citations per publication |
|---|---|---|
| USA | 6,050 (30.5%) | 37.4 |
| UK | 1,519 (7.7%) | 35.3 |
| China | 1,374 (6.9%) | 14.6 |
| Japan | 1,359 (6.8%) | 20.9 |
| Germany | 1,219 (6.1%) | 29.0 |
| Italy | 1,091 (5.5%) | 31.5 |
| Canada | 1,058 (5.3%) | 31.3 |
| France | 969 (4.9%) | 28.3 |
| Spain | 794 (4.0%) | 26.3 |
| India | 732 (3.7%) | 14.9 |
