| Study* | Newcastle–Ottawa Scale quality assessment score | ||
|---|---|---|---|
| Selection (max 4 stars) | Comparability (max 2 stars) | Outcome (max 3 stars) | |
| Postier et al.18 | ★ ★ | ★ | ★ ★ ★ |
| Fraser et al.11 | ★ ★ ★ | ★ | ★ ★ |
| Knapp et al.15 | ★ ★ ★ | ★ | ★ ★ |
| Keele et al.12 | ★ ★ ★ | ★ | ★ |
| Arland et al.10 | ★ ★ ★ | ★ ★ | |
| Dussel et al.14 | ★ ★ ★ | ★ | |
| Ward-Smith et al.17 | ★ | ★ ★ | |
| Gans et al.5 | ★ | ★ | ★ |
| Pascuet et al.13 | ★ ★ | ★ | |
*The case series of 3 patients16 and the conference abstract19 were not included in the quality assessment.