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.
Studies included for review classified by country or region
| Country | n (%) |
|---|---|
| USA | 173 (45.9) |
| Europe | 61 (16.2) |
| Australia/New Zealand/Fiji | 41 (10.9) |
| United Kingdom | 40 (10.6) |
| Canada | 16 (4.2) |
| Middle East | 9 (2.4) |
| Multiple other | 8 (2.1) |
| Unspecified/other | 7 (1.9) |
| Multiple Western countries | 7 (1.9) |
| China/Taiwan/Hong Kong | 6 (1.6) |
| Japan | 5 (1.3) |
| Brazil | 3 (0.8) |
| Ethiopia | 1 (0.3) |
