Table 2.
Sources searched by screened systematic reviews (N = 101)
| Databases | Search engines and platforms | ||
|---|---|---|---|
| PubMed | 62 | Google Scholar | 29 |
| Embase | 45 | 2 | |
| MEDLINE | 29 | OVID | 2 |
| Web of Science | 25 | ||
| Cochrane Library | 18 | Preprint Servers | |
| WHO or CDCa | 13 | MedXriv | 14 |
| China National Knowledge Infrastructure (CNKI) | 10 | BioRxiv | 4 |
| Wan-fang database | 9 | Research Square | 1 |
| CINAHL | 7 | preprints.org | 1 |
| CENTRAL | 6 | Unspecified preprint server | 1 |
| Medline/PubMed | 5 | ||
| Chinese Biomedical Literature Databases | 4 | Trial Registries | |
| Chinese Scientific Journal Database (VIP) | 4 | Clinicaltrials.gov | 6 |
| LILACS | 4 | Chinese clinical trials registry | 1 |
| Epistemonikos’ COVID-19 L-OVE | 3 | Cochrane COVID-19 Study register | 1 |
| PsycINFO | 2 | EudraCT | 1 |
| PubMed Central | 2 | ISRCTN registry | 1 |
| Academic Search Premier | 1 | ||
| China Academic Literature Database | 1 | Journals | |
| Global Health | 1 | BMJ | 1 |
| PEDro | 1 | Cells | 1 |
| SciELO | 1 | JAMA | 1 |
| Toxline | 1 | Lancet | 1 |
| Nature | 1 | ||
| Publishers | New England Journal of Medicine | 1 | |
| Science Direct (Elsevier) | 5 | Science | 1 |
| Springer Nature | 1 | ||
| Wiley Online Library | 1 | Sources not stated | 11 |
a
It was not always clear if the agency’s COVID-19 database was searched or if it was a general search of the agency website.