Fig. 4

The evidence mapping on ECMO. X-axis, effect estimate on the certainty of the evidence statement; Y-axis, the number of primary research studies in the selected SR; bubble size, the number of SRs on this topic; bubble color, evidence quality of the findings by GRADE system assessment. ARDS adult respiratory distress syndrome, ALI acute lung injury, H1N1 influenza A, ALF acute liver failure, ACLF acute on chronic liver failure, ARF acute respiratory failure