Table 2. Country study areas.
| Country | Number of Studies |
|---|---|
| United States | 56 |
| Australia | 16 |
| Canada | 5 |
| Brazil | 3 |
| England | 2 |
| Sweden | 2 |
| Norway | 2 |
| New Zealand | 1 |
| Finland | 1 |
| Denmark | 1 |
| Scotland | 1 |
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