Table 2.
Distribution by region for the included studies
| Row labels | Percentage |
| Africa | 56.8 |
| Asia and Pacific | 16.2 |
| South/Latin America | 13.5 |
| North America | 8.1 |
| Arab States | 2.7 |
| Europe | 2.7 |
| Total | 100.0 |
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