Number of authors with country identified: 8536
Number of countries represented: 91
| Country | Scientists |
| USA | 3100 |
| United Kingdom | 628 |
| Germany | 472 |
| Japan | 417 |
| Canada | 379 |
| Australia | 331 |
| France | 331 |
| China | 320 |
| Spain | 192 |
| Netherlands | 168 |
| Sweden | 156 |
| Italy | 145 |
| Switzerland | 141 |
| Norway | 124 |
| Finland | 118 |
| Denmark | 110 |
| Brazil | 95 |
| Korea, Republic of | 84 |
| India | 82 |
| Turkey | 67 |
| Russia | 65 |
| Taiwan | 62 |
| Austria | 60 |
| Belgium | 58 |
| New Zealand | 54 |
| Portugal | 47 |
| South Africa | 43 |
| Poland | 36 |
| Greece | 36 |
| Israel | 34 |
| Mexico | 33 |
| Argentina | 29 |
| Chile | 25 |
| Hungary | 24 |
| Ireland | 22 |
| Hong Kong | 22 |
| Thailand | 19 |
| Singapore | 18 |
| Czech Republic | 17 |
| Estonia | 17 |
| Lithuania | 16 |
| Iran | 12 |
| Romania | 11 |
| Iceland | 11 |
| Colombia | 10 |
| Bulgaria | 9 |
| Saudi Arabia | 7 |
| Croatia | 7 |
| Slovenia | 7 |
| Malaysia | 7 |
| United Arab Emirates | 5 |
| Slovakia | 5 |
| Philippines | 5 |
| Pakistan | 4 |
| Viet Nam | 4 |
| Sri Lanka | 4 |
| Jordan | 3 |
| Latvia | 3 |
| Nepal | 3 |
| Uruguay | 3 |
| Serbia | 3 |
| Ascension Island | 2 |
| Peru | 2 |
| Jamaica | 2 |
| Indonesia | 2 |
| Botswana | 2 |
| Cuba | 2 |
| Egypt | 2 |
| Monaco | 2 |
| Brunei Darussalam | 2 |
| Lebanon | 1 |
| Kuwait | 1 |
| Costa Rica | 1 |
| Greenland | 1 |
| Mali | 1 |
| Puerto Rico | 1 |
| Barbados | 1 |
| Cyprus | 1 |
| Tunisia | 1 |
| Malta | 1 |
| Faroe Islands | 1 |
| Trinidad and Tobago | 1 |
| Azerbaijan | 1 |
| Venezuela | 1 |
| Tonga | 1 |
| Ghana | 1 |
| Ukraine | 1 |
| Mozambique | 1 |
| Luxembourg | 1 |
| Oman | 1 |
| Macedonia | 1 |