Table 3.
Newcastle–Ottawa Scale scores of studies.
| Study | Selection | Comparability | Outcome | Total |
|---|---|---|---|---|
| Chen 2014 | ★★★★ | ★★ | 6 | |
| Li 2018 | ★★★★ | ★ | ★★ | 7 |
| Lian 2016 | ★★★★ | ★ | 5 | |
| Mancuso 2016 | ★★★★ | ★★ | 6 | |
| Tian 2018 | ★★★★ | ★ | ★★ | 7 |
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