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| Methods | Non‐random, retrospective | |
| Participants | 55 | |
| Interventions | EC/IC bypass | |
| Outcomes | Death from all causes, any stroke during follow up, death or dependency | |
| Notes | Only patients with viable brain tissue | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Allocation concealment? | Unclear risk | D ‐ Not used |
