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The Top 20 Groups of Countries with the Most Collaboration
| From | To | Frequency |
|---|---|---|
| USA | UNITED KINGDOM | 93 |
| USA | ITALY | 77 |
| ITALY | UNITED KINGDOM | 51 |
| USA | CANADA | 50 |
| USA | INDIA | 47 |
| UNITED KINGDOM | GERMANY | 43 |
| USA | CHINA | 43 |
| USA | GERMANY | 39 |
| UNITED KINGDOM | SPAIN | 37 |
| ITALY | GERMANY | 36 |
| ITALY | SPAIN | 36 |
| USA | AUSTRALIA | 36 |
| USA | BRAZIL | 32 |
| USA | SPAIN | 31 |
| UNITED KINGDOM | AUSTRALIA | 28 |
| UNITED KINGDOM | NETHERLANDS | 28 |
| UNITED KINGDOM | SWITZERLAND | 27 |
| USA | SAUDI ARABIA | 27 |
| USA | SWITZERLAND | 27 |
