3.4. Risk assessment of bias and quality assessment
This protocol is extracted from research article:
Effectiveness of different types of skin grafting for treating venous leg ulcers
Medicine (Baltimore), Apr 16, 2021; DOI: 10.1097/MD.0000000000025597

Two review authors will independently use Cochrane's Risk of Bias tool to appraise the risk of bias of each included study.[18] Any discrepancy between two reviewers will be resolved by discussion and a third reviewer where necessary. Meanwhile, we followed the Grading of Recommendations Assessment Development and Evaluation (GRADE) approach proposed by Salanti and colleagues to assess the certainty of evidence from the network meta-analysis for each network contrast and the ranking of intervention groups: the overall certainty could be rated from high, moderate, low to very low.[19]

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