Publications in the most productive countries
| Country | N | % | N per million people | Total citations | H-index |
| USA | 1041 | 27.00 | 3.21 | 19 848 | 61 |
| Germany | 368 | 9.55 | 4.56 | 6937 | 44 |
| England | 333 | 8.64 | 5.17 | 7899 | 46 |
| Canada | 308 | 7.99 | 8.71 | 4206 | 32 |
| Italy | 272 | 7.06 | 4.39 | 5199 | 37 |
| France | 185 | 4.80 | 2.77 | 3115 | 28 |
| Japan | 167 | 4.33 | 1.32 | 1862 | 23 |
| Australia | 151 | 3.92 | 6.57 | 3983 | 35 |
| China (PRC) | 139 | 3.61 | 0.10 | 836 | 15 |
| The Netherlands | 126 | 3.27 | 7.40 | 2060 | 21 |
| Spain | 126 | 3.27 | 2.59 | 2066 | 21 |
| Turkey | 111 | 2.88 | 1.38 | 684 | 14 |
| Austria | 99 | 2.57 | 11.36 | 2021 | 27 |
| Switzerland | 88 | 2.28 | 60.63 | 1921 | 25 |
| South Korea | 86 | 2.23 | 1.69 | 564 | 11 |
| Belgium | 74 | 1.92 | 6.49 | 1685 | 25 |
| Brazil | 66 | 1.71 | 0.32 | 858 | 13 |
| Israel | 61 | 1.58 | 7.46 | 2018 | 19 |
| Poland | 58 | 1.51 | 1.51 | 880 | 16 |
| Sweden | 57 | 1.48 | 5.77 | 1201 | 21 |