Table 1.
Number of studies by study location.
| Country | Value, n (%) |
| United States | 10 (40) |
| Canada | 3 (12) |
| Australia | 2 (8) |
| Germany | 2 (8) |
| France | 1 (4) |
| Oman | 1 (4) |
| Russia | 1 (4) |
| Rwanda | 1 (4) |
| Singapore | 1 (4) |
| Turkey | 1 (4) |
| United Kingdom | 1 (4) |
| Zimbabwe | 1 (4) |
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.