Table 4.
Quality assessment of the included cohort studies according to the Newcastle–Ottawa Scale.
| First author (year) | Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Outcome not present at start of study | Comparability of cohorts | Assessment of outcome | Follow-up long enough for outcomes to occur | Adequacy of follow-up of cohorts | Total quality score |
|---|---|---|---|---|---|---|---|---|---|
| Jin (2020) | – | * | * | – | – | – | – | – | 2 |
| Leung (2013) | – | * | – | – | – | – | – | – | 1 |
| Sánchez‑Villegas (2018) | – | * | – | * | * | – | * | – | 4 |