Supplementary Table S2.
Retrospective studies appraised with the Newcastle-Ottawa scale
| Selection | Comparability | Outcome | AHRQ standards | |
|---|---|---|---|---|
| Baher et al., 2018 | ★★★★ | ★★ | ★★★ | Good |
| Ücer et al., 2020 | ★★★ | ★ | ★★ | Good |
| Vassallo et al., 2020 | ★★★★ | ★★ | ★★ | Good |
| Vassallo et al., 2019 | ★★★★ | ★★ | ★★ | Good |
| Chen et al., 2019 | ★★★★ | ★★ | Good | |
| Chen et al., 2020 (ESO-I) | ★★★★ | ★★ | Good | |
| Chen et al., 2020 (ESO-II) | ★★★★ | ★★ | Good | |
| Reddy et al., 2019 | ★★★★ | ★★ | Good | |
| Winkle et al., 2019 | ★★★ | ★★ | Good | |
| Winkle et al., 2020 | ★★★★ | ★★★ | Good |
AHRQ - Agency for Healthcare Research and Quality