| Similarity | Rank | |
|---|---|---|
| MEDLINE | 0.844 | 98555 |
| PubMed | 0.804 | 49175 |
| Elsevier | 0.718 | 55357 |
| full-text | 0.709 | 53552 |
| ProQuest | 0.704 | 98606 |
| Medscape | 0.701 | 96501 |
| JAMA | 0.671 | 53150 |
| NCI | 0.662 | 53723 |
| bibliographic | 0.654 | 45374 |
| PMID | 0.651 | 86550 |
| BMJ | 0.641 | 65609 |
| ACS | 0.637 | 26125 |
| Cochrane | 0.633 | 35235 |
| NEJM | 0.633 | 95648 |
| LexisNexis | 0.631 | 79110 |
| peer-reviewed | 0.623 | 25104 |
| Thesaurus | 0.619 | 88890 |
| Lancet | 0.619 | 38806 |
| Merck | 0.618 | 28101 |
| Lexis | 0.616 | 96130 |
| Databases | 0.612 | 46848 |
| Clearinghouse | 0.611 | 60386 |
| ERIC | 0.611 | 74604 |
| meta-analysis | 0.609 | 39189 |
| WebMD | 0.607 | 34207 |