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General characteristics of included studies_
| Author | Study design | Group | Cases | Age (y) | Gender (M/F) | Outcomes | Newcastle-Ottawa Scale |
|---|---|---|---|---|---|---|---|
| Chen et al. 201215 | Retrospective | PVP | 33 | 69.2 ± 6.3 | 4/29 | D, E, F, G | ⋆⋆⋆⋆⋆ |
| PKP | 30 | 68.7 ± 6.5 | 3/27 | ||||
| Feng and Sun | Retrospective | PVP | 20 | 72.3 ± 5.4 | 12/28 | A, B, C, D, E, F, G | ⋆⋆⋆⋆⋆⋆ |
| 201816 | PKP | 20 | |||||
| Gao et al. 201617 | Retrospective | PVP | 38 | 73 ± 6 | 20/18 | B, C, D, F | ⋆⋆⋆⋆⋆ |
| PKP | 35 | 75 ± 6 | 16/19 | ||||
| Li 201318 | Retrospective | PVP | 7 | 71.8 ± 7.69 | 3/4 | A, C, D, F, | ⋆⋆⋆⋆⋆⋆ |
| PKP | 5 | 2/3 | |||||
| Shi et al. 201719 | Retrospective | PVP | 10 | 75.1 ± 3.6 | 7/16 | A, B, C, D, E, G | ⋆⋆⋆⋆⋆⋆ |
| PKP | 13 | ||||||
| Yu et al. 201620 | Retrospective | PVP | 14 | 74.47 ± 5.79 | 5/9 | A, B, C, D, E, F | ⋆⋆⋆⋆⋆⋆ |
| PKP | 28 | 71.56 ± 8.35 | 9/16 | ||||
| Yu et al. 201621 | Retrospective | PVP | 48 | 74.6 (63–85) | 10/38 | A, B, C, D, E, F, G | ⋆⋆⋆⋆⋆⋆ |
| PKP | 20 | 75.9 (65–87) | 4/16 | ||||
| Zhang et al. 201522 | Retrospective | PVP | 38 | 75.58 ± 4.97 | 10/28 | B, D, E, F, G | ⋆⋆⋆⋆⋆⋆ |
| PKP | 35 | 73.74 ± 4.35 | 9/26 | ||||