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Quality assessment using the Newcastle-Ottawa scale.
| Study | Cohort Representativeness | Selection of Non-Exposed Cohort | Ascertainment of Exposure | The Outcome of Interest Not Present | comparability of Cohorts | Assessment of Outcome | Follow-Up Long Enough | Adequacy of Follow Up of Cohorts | Total Score | Quality of Study |
|---|---|---|---|---|---|---|---|---|---|---|
| Yang et al. [28] | * | no | * | * | * | * | * | * | 7 | medium |
| Pujol et al. [29] | * | no | * | * | no | * | * | * | 6 | medium |
| Georgekutty et al. [30] |
* | no | * | * | no | * | * | * | 6 | medium |
* high quality choice.
