Table 1.
Top 10 countries in terms of number of publications, frequency of citations, and total association intensity.
| Rank | Countries | Documents | Countries | Total Link Strength | Countries | Citations |
|---|---|---|---|---|---|---|
| 1 | China | 1746 | USA | 686 | USA | 57013 |
| 2 | USA | 1036 | England | 454 | China | 28092 |
| 3 | England | 292 | China | 386 | England | 19283 |
| 4 | Italy | 209 | Germany | 306 | Germany | 8703 |
| 5 | Germany | 189 | Italy | 271 | Italy | 8346 |
| 6 | Spain | 163 | France | 262 | Switzerland | 7543 |
| 7 | France | 154 | Netherlands | 228 | France | 7415 |
| 8 | Canada | 135 | Spain | 190 | Canada | 7063 |
| 9 | Netherlands | 121 | Canada | 183 | Netherlands | 6718 |
| 10 | Denmark | 104 | Sweden | 173 | Sweden | 5217 |