Table 2.
The cooperation among countries/regions.
| From | To | Frequency |
|---|---|---|
| USA | China | 66 |
| USA | Canada | 40 |
| USA | United Kingdom | 38 |
| USA | Spain | 34 |
| USA | Italy | 33 |
| Spain | Italy | 29 |
| China | Canada | 23 |
| Italy | United Kingdom | 23 |
| Spain | United Kingdom | 23 |
| USA | France | 23 |
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