Table 5.
Ten most studied countries from collected articles.
| Country | Articles | Percentage (%) |
|---|---|---|
| USA | 46 | 30% |
| Germany | 13 | 8% |
| China | 8 | 5% |
| Portugal | 8 | 5% |
| Turkey | 6 | 4% |
| United Kingdom | 5 | 3% |
| Australia | 5 | 3% |
| Pakistan | 5 | 3% |
| Spain | 5 | 3% |
| Italy | 4 | 3% |
| Iran | 4 | 3% |
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