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Number of studies included by country/region of origin.
| Country | Region | Number of Articles |
|---|---|---|
| Australia | Asia | 1 |
| Brazil | South America | 3 |
| Canada | North America | 1 |
| India | Asia | 2 |
| Iran | Middle East | 1 |
| Kuwait | Middle East | 1 |
| New Zealand | Asia | 2 |
| Pakistan | Asia | 5 |
| Saudi Arabia | Middle East | 4 |
| South Africa | Africa | 1 |
| Sweden | Europe | 1 |
| United States (U.S.) | North America | 3 |
| United Kingdom (U.K.) | Europe | 1 |
| TOTAL | 26 |
