| 1 | Epidemiologic studies/ |
| 2 | Exp case control studies/ |
| 3 | Exp cohort studies/ |
| 4 | Case control.tw. |
| 5 | (cohort adj (study or studies)).tw. |
| 6 | Cohort analy$.tw. |
| 7 | (Follow up adj (study or studies)).tw. |
| 8 | (observational adj (study or studies)).tw. |
| 9 | Longitudinal.tw. |
| 10 | Retrospective.tw. |
| 11 | Cross sectional.tw. |
| 12 | Cross‐sectional studies/ |
| 13 | Or/1‐12 |
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