| Author, Year |
Representativeness of Exposed Cohort |
Selection of Non-Exposed Cohort |
Ascertainment of Exposure |
Outcome Absent at Baseline |
Comparability of Cohorts |
Assessment of Outcome |
Follow-Up Duration Adequate |
Adequacy of Follow-Up |
Total NOS Score (Max 9) |
| Dammerer et al. 2022 |
★ |
★ |
★ |
★ |
★★ |
★ |
★ |
★ |
9/9 |
| Han et al. 2012 |
★ |
— |
★ |
★ |
★ |
★ |
★ |
★ |
7/9 |
| Hawkins et al. 2025 |
★ |
★ |
★ |
★ |
★ |
★ |
★ |
★ |
8/9 |
| Ohashi et al. 2025 |
★ |
★ |
★ |
★ |
★★ |
★ |
★ |
★ |
9/9 |
| Weiner et al. 2024 |
★ |
★ |
★ |
★ |
★★ |
★ |
★ |
★ |
9/9 |
| Soballe et al. 1988 |
★ |
★ |
★ |
★ |
★ |
★ |
★ |
★ |
8/9 |