Study | Design | Selection | Comparability | Outcome | Total | |||||
---|---|---|---|---|---|---|---|---|---|---|
Representativeness of exposed cohort | Selective of nonexposed Cohort | Ascertainment of exposure | Outcome not present at start | Assessment of outcome | Adequate follow-up length | Adequacy of follow-up | ||||
Li | R | * | * | * | ** | * | * | * | 8 | |
Dickson | R | * | * | * | ** | * | * | * | 8 | |
Kiriakopoul | R | * | * | ** | * | * | * | 7 | ||
Shiraishi | R | * | * | * | ** | * | * | * | 8 |