| Source | Results (with duplicates) | Results (unique) |
| MEDLINE | 2323 | 1728 |
| Embase | 2490 | 744 |
| CINAHL | 729 | 154 |
| Cochrane COVID‐19 Study Register | 1102 | 503 |
| WHO COVID‐19 Global literature on coronavirus disease | 3358 | 1473 |
| Google Scholar (for citing references) | 71 | 58 |
| Total: | 10,073 | 4660 |
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