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The top 10 productive countries.
| Country | Number of publications | Citations |
|---|---|---|
| Usa | 798 | 57,521 |
| China | 407 | 13,522 |
| Italy | 286 | 15,382 |
| United Kingdom | 179 | 11,225 |
| Canada | 175 | 9,765 |
| France | 173 | 9,967 |
| Germany | 157 | 9,310 |
| Japan | 126 | 5,232 |
| Spain | 123 | 5,026 |
| Sweden | 104 | 5,787 |
