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Baseline data of the included studies
| No. | First author | Year | Country | Design | NOS |
|---|---|---|---|---|---|
| 1 | Deng [13] | 2020 | China | Retrospective | 8 |
| 2 | Hu [14] | 2019 | China | Retrospective | 8 |
| 3 | Hwang [15] | 2018 | Korea | Retrospective | 8 |
| 4 | Liu [16] | 2020 | China | Retrospective | 8 |
| 5 | Lu [17] | 2018 | China | Randomized controlled trial | – |
| 6 | Rostambeigi [18] | 2019 | USA | Retrospective | 8 |
| 7 | Wu [19] | 2021 | China | Retrospective | 8 |
| 8 | Yang [20] | 2020 | China | Retrospective | 8 |
NOS – Newcastle-Ottawa Scale.
