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| Author | Selection | Comparability | Outcome | |||||
|---|---|---|---|---|---|---|---|---|
| Representativeness of exposed cohort | Selection of non‐exposed cohort | Ascertainment of exposure | Outcome of interest not present at start of study | Assessment | Follow up: outcomes | Follow up: cohorts | ||
| Burrows | * | * | * | * | ||||
| Wilkinson | * | * | * | * | * | |||
