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Top 10 countries about FD.
| Rank | Country/region | Documents | Citations | Total link strength |
|---|---|---|---|---|
| 1 | United States | 499 | 24,926 | 398 |
| 2 | China | 421 | 9,513 | 162 |
| 3 | Japan | 303 | 8,817 | 104 |
| 4 | Belgium | 206 | 12,552 | 191 |
| 5 | Australia | 189 | 11,442 | 272 |
| 6 | South Korea | 164 | 2,677 | 61 |
| 7 | Italy | 126 | 6,921 | 98 |
| 8 | Germany | 110 | 5,067 | 129 |
| 9 | England | 103 | 6,373 | 162 |
| 10 | Canada | 76 | 6,482 | 112 |
