| 1. | “observational” [tiab] |
| 2. | “cohort” [tiab] |
| 3. | cohort studies [mh] |
| 4. | “epidemiologic” [tiab] |
| 5. | “epidemiological” [tiab] |
| 6. | “systematic review” [tiab] |
| 7. | “systematic reviews” [tiab] |
| 8. | “meta-analysis” [tiab] |
| 9. | “meta-analyses” [tiab] |
| 10. | meta analysis [pt] |
| 11. | “overview” [tiab] |
| 12. | #1 OR #2 OR #3 OR #4 OR #5 |
| 13. | #6 OR #7 OR #8 OR #9 OR #10 OR #11 |
| 14. | #12 AND #13 |
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