Study | Selection**** | Comparability** | Outcome*** | Score |
|---|
Boven et al. [24] | **** | * | *** | 8 |
Krennmair et al. [25] | **** | * | ** | 7 |
Zou et al. [26] | **** | * | *** | 8 |
Katsoulis et al. [28] | **** | * | *** | 8 |
Ferrigno et al. [10] | **** | ** | ** | 8 |
- Studies that met five or more of the NOS score criteria were considered as good quality
