| Table 3. Newcastle-Ottawa classification of quality of non-randomized studies. | |||
| Author/year | Selection | Comparability | Outcome |
|---|---|---|---|
| Wang et al. (2021) | 3 | 0 | 2 |
| Violette et al. (2023) | 3 | 2 | 3 |
| Lin et al. (2022) | 4 | 1 | 3 |
| Kong et al. (2022) | 3 | 1 | 2 |
| Jiang et al. (2021) | 3 | 2 | 2 |
| Al-Khatib et al. (2024) | 3 | 0 | 3 |
| Zhu et al. (2016) | 4 | 2 | 3 |
| Nagata et al. (2019) | 4 | 2 | 3 |
| Zhang et al. (2024) | 3 | 0 | 3 |
| Tanaka et al. (2020) | 3 | 1 | 1 |
| Esh-Broder et al. (2011) | 4 | 1 | 3 |
| Modest et al. (2021) | 3 | 2 | 2 |
| Imafuku et al. (2021) | 3 | 2 | 1 |