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The Newcastle–Ottawa scale scores of the included case–control studies
| Study | Case definition | Representativeness of the cases | Selection of controls | Definition of controls | Comparability | Assessment of exposure | Same method of ascertainment | Non-response rate | Total |
|---|---|---|---|---|---|---|---|---|---|
| Brucato et al. (2017) [46] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 6 |
| Christian et al. (2018) [45] | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 7 |
| Croen et al. (2019) [22] | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 6 |
| Saunders et al. (2019) [44] | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 4 |
| Zerbo et al. (2013) [27] | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 5 |
