| 1 | Clinical study/ |
| 2 | Case control study |
| 3 | Family study/ |
| 4 | Longitudinal study/ |
| 5 | Retrospective study/ |
| 6 | Prospective study/ |
| 7 | Randomised controlled trials/ |
| 8 | 6 not 7 |
| 9 | Cohort analysis/ |
| 10 | (Cohort adj (study or studies)).mp. |
| 11 | (Case control adj (study or studies)).tw. |
| 12 | (follow up adj (study or studies)).tw. |
| 13 | (observational adj (study or studies)).tw. |
| 14 | (epidemiologic$ adj (study or studies)).tw. |
| 15 | (cross sectional adj (study or studies)).tw. |
| 16 | Or/1‐5,8‐15 |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.