Search strategy for MEDLINE and EMBASE via the OVID database
| 1 | exp migraine |
| 2 | limit 1 to meta analysis |
| 3 | systematic review.mp. |
| 4 | 1 and 3 |
| 5 | 2 or 4 |
| 6 | Meta analysis |
| 7 | systematic review.mp. |
| 8 | 1 and (6 or 7) |
| 9 | 4 or 8 |
| 10 | remove duplicates from 9 |
| 11 | limit 10 to (editorial or letter) |
| 12 | 10 not 11 |
| 13 | limit 12 to yr="2005–2014” |