Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The top ten list of the number of articles and citations by country
| Country | Documents | Country | Citations |
|---|---|---|---|
| USA | 75 | Italy | 672 |
| England | 40 | USA | 454 |
| Italy | 30 | England | 300 |
| Germany | 24 | Canada | 293 |
| Canada | 23 | Spain | 255 |
| Spain | 18 | Australia | 240 |
| Australia | 14 | Germany | 236 |
| Turkey | 12 | France | 207 |
| France | 11 | New Zealand | 205 |
| New Zealand | 9 | Portugal | 190 |
