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Top 10 countries/regions in terms of number of publications, the corresponding frequency of citations and centrality.
| Rank | Countries/regions | publications | Citations | Centrality |
|---|---|---|---|---|
| 1 | USA | 1555 | 93856 | 0.24 |
| 2 | China | 738 | 15214 | 0.05 |
| 3 | Germany | 714 | 49879 | 0.26 |
| 4 | England | 342 | 19846 | 0.18 |
| 5 | Italy | 280 | 12031 | 0.10 |
| 6 | Japan | 271 | 8594 | 0.04 |
| 7 | Canada | 249 | 19170 | 0.16 |
| 8 | Sweden | 224 | 12781 | 0.12 |
| 9 | Netherlands | 220 | 10669 | 0.10 |
| 10 | France | 216 | 12552 | 0.08 |
