Fig. 2
From: Decompressive craniectomy for malignant middle cerebral artery infarctions: a meta-analysis
a Risk of bias summary showing our judgments about each risk of bias item for each included study. Green plus sign = low risk; red minus sign = high risk; yellow question mark = not reported; blank = unclear risk. b Risk of bias graph showing our judgments about each risk of bias item for each included study. c Quality assessment of four observational studies with NOS