Table 2.
Top 20 most productive countries.
| Country rank | Country /region |
publication | Citations | Citations/publication |
|---|---|---|---|---|
| 1 | Canada | 51 | 1115 | 21.86 |
| 2 | US | 385 | 6070 | 15.77 |
| 3 | Australia | 96 | 1472 | 15.33 |
| 4 | Netherlands | 24 | 259 | 10.79 |
| 5 | Portugal | 27 | 285 | 10.56 |
| 6 | Iran | 58 | 593 | 10.22 |
| 7 | England | 88 | 894 | 10.16 |
| 8 | Taiwan | 54 | 547 | 10.13 |
| 9 | Singapore | 28 | 270 | 9.64 |
| 10 | China | 164 | 1328 | 8.1 |
| 11 | Turkey | 137 | 905 | 6.61 |
| 12 | South Africa | 28 | 184 | 6.57 |
| 13 | Spain | 125 | 789 | 6.31 |
| 14 | Japan | 24 | 95 | 3.96 |
| 15 | Malaysia | 67 | 237 | 3.54 |
| 16 | Indonesia | 198 | 494 | 2.49 |
| 17 | Russia | 64 | 138 | 2.16 |
| 18 | Romania | 31 | 63 | 2.03 |
| 19 | Columbia | 26 | 40 | 1.54 |
| 20 | Mexico | 24 | 26 | 1.08 |