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Portal searches results
| Portal | Articles found by multiple portals | Articles found only by a single portal |
|---|---|---|
| PubMed | 82 | 29 |
| PubMedCentral | 540 | 1320 |
| Google scholar | 372 | 315 |
| Nature | 52 | 4 |
| Wiley | 226 | 186 |
| ScienceDirect | 82 | 87 |
| SpringerLink | 81 | 18 |
Uniqueness and redundancy in over multiple portal searches
