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Quality rating for the observational studies using the Newcastle–Ottawa Scale
| Author | Selection | Comparability | Exposure/outcome |
|---|---|---|---|
| Gravius 2019 | ** | – | * |
| Huygen 2019 | ** | – | ** |
| Skaribas 2019 | * | – | – |
| Morgalla 2017 | ** | – | * |
| Morgalla 2019 | ** | – | * |
| Liem 2015 | ** | – | ** |
| Koetsier 2020 | ** | – | ** |
Quality of cohort and case control studies was determined using the Newcastle–Ottawa Scale, which evaluates three categories: selection (maximum 4 stars), comparability (maximum 2 stars), and outcome (maximum 3 stars)
