Fig. 3

Potential bias risk involved in the present study. a Risk of bias of the included literature. 1 = Random sequence generation (selection bias), 2 = Allocation concealment (selection bias), 3 = Blinding of participations and personnel (performance bias), 4 = Blinding of outcome assessment (detection bias), 5 = Incomplete outcome data (attrition bias), 6 = Selective reporting (reporting bias), 7 = Other bias. b Summary of the bias risk for the included literature. c Funnel plot of the scores of neurological deficits. d Funnel plot of the overall response rate