Table 2. Overview of database search parameters and number of documents retrieved per database.
| Database | Search on | Estimated N.
of documents = |
Limiting parameters |
|---|---|---|---|
|
Web of Science
Core Collection |
Title or abstract | Approx. 175,000 | Document type (article or review only -- excluding book
chapters, proceedings, comments, and editorials), publishing year, some excluded journals. |
| Scopus | Title, abstract
or keywords |
Approx. 300,000 | |
| Medline | Approx. 50,000 | ||
|
Total (after
duplicate removal) |
Approx. 350,000 |