No. | Reference | Selection | Compatibility | Exposure | |||||
---|---|---|---|---|---|---|---|---|---|
Is the case definition adequate? | Representativeness of the cases | Selection of controls | Definition of controls | Ascertainment of exposure | Same method of ascertainment for cases and controls | Non-response rate | |||
1. | Bottieau et al. [26] | * | * | * | * | ** | * | * | * |
2. | Chaparro et al. [23] | * | * | * | * | ** | * | * | * |
3. | Douglas et al.[21] | * | Â | * | * | ** | * | * | * |
4. | Hwang et al. [24] | * | * | * | * | ** | * | * | * |
5. | Langford et al. [22] | * | * | * | * | ** | * | * | * |
6. | Wangdahl et al. [25] | * | * | * | * | ** | * | * | * |