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Top 10 countries in terms of number of publications.
| Rank | Country | No. of documents | Total citations |
|---|---|---|---|
| 1 | USA | 345 | 8,656 |
| 2 | China | 178 | 2,481 |
| 3 | United Kingdom | 87 | 2,052 |
| 4 | Italy | 80 | 1,371 |
| 5 | Germany | 59 | 888 |
| 6 | Japan | 56 | 487 |
| 7 | Canada | 56 | 764 |
| 8 | Spain | 41 | 503 |
| 9 | South Korea | 36 | 548 |
| 10 | Netherlands | 35 | 784 |
