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Top 10 countries/regions by number of publications.
| Rank | Countries/regions | Publications, n (%) | Citations | Total link strength |
| 1 | United States | 234 (42.16) | 2,395 | 16 |
| 2 | England | 132 (23.78) | 2,877 | 60 |
| 3 | Australia | 46 (8.29) | 565 | 21 |
| 4 | Canada | 23 (4.14) | 174 | 20 |
| 5 | Scotland | 22 (3.96) | 280 | 10 |
| 6 | Spain | 19 (3.43) | 75 | 22 |
| 7 | Netherlands | 17 (3.06) | 257 | 21 |
| 8 | New Zealand | 17 (3.06) | 451 | 5 |
| 9 | Wales | 17 (3.06) | 399 | 29 |
| 10 | Poland | 15 (2.70) | 105 | 27 |
