| D | Search | Hits |
|---|---|---|
| #1 | MeSH descriptor: [Migraine Disorders] explode all trees | 1832 |
| #2 | MeSH descriptor: [Post-Exposure Prophylaxis] explode all trees | 39 |
| #3 | MeSH descriptor: [Pre-Exposure Prophylaxis] explode all trees | 28 |
| #4 | headach* | 21148 |
| #5 | MeSH descriptor: [Flunarizine] explode all trees | 127 |
| #6 | placebo | 180379 |
| #7 | migraine frequenc* | 907 |
| #8 | migraine attac* | 1398 |
| #9 | #1 or #2 or #3 or #4 | 21633 |
| #10 | #7 or #8 | 1849 |
| #11 | #5 and #6 and #9 and #10 in Cochrane Reviews (Reviews and Protocols) and Other Reviews | 21 |
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