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The top 10 productive countries.
| Rank | Country | Publications (N) | Citations |
|---|---|---|---|
| 1 | United States | 1,716 | 74,784 |
| 2 | China | 630 | 8,684 |
| 3 | United Kingdom | 376 | 18,759 |
| 4 | Japan | 331 | 8,090 |
| 5 | Germany | 311 | 11,819 |
| 6 | France | 282 | 12,439 |
| 7 | Italy | 266 | 9,305 |
| 8 | Canada | 236 | 12,108 |
| 9 | Australia | 199 | 8,015 |
| 10 | Denmark | 165 | 5,893 |
