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.
| Country and Regions | Frequency | Country and Regions | Total Citations |
|---|---|---|---|
| USA | 236 | Hong Kong | 1291 |
| Canada | 79 | USA | 877 |
| China | 75 | UK | 568 |
| UK | 52 | China | 453 |
| Taiwan | 45 | Taiwan | 444 |
| South Korea | 31 | Canada | 379 |
| Singapore | 26 | Thailand | 148 |
| Germany | 18 | Singapore | 98 |
| Italy | 16 | Australia | 97 |
| Australia | 15 | Korea | 65 |
