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 |