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Newcastle ottawa scale.
| Studies | Selection | Comparability | Outcome | Overall | |||||
|---|---|---|---|---|---|---|---|---|---|
| Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start of study | assessment of outcome | Adequacy follow-up length | Adequacy of follow up | |||
| Gomez-Almaguer et al. (21) | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 6 |
| Sakamoto et al. (15) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
