| Focus | Type of article |
|---|---|
| Treatment | Randomized controlled trials (1) |
| Diagnosis | Studies that quantify sensitivity and specificity (1) |
| Adverse Effects | Studies reporting serious adverse effects of treatments (3). |
| Etiology | Case controls and cohorts (1) |
| Prognosis | Cohorts (1) |
| Physical diagnosis | Studies that quantify the sensitivity and specificity of physical findings (2). |
| Screening/prevention | Studies that, irregardless of study design, address screening and prevention (this filter has not been validated). |