detection bias Cochrane Risk of Bias tool hier six major types of bias Assessing Risk of Bias in Included Studies Assessing risk of bias in included studies. Chapter 8 Cochrane Risk of Bias tool Cochrane Risk of Bias Assessment tool hier skjevheter risk of bias tool Cochrane Cochrane risk of bias Ferramenta da Cochrane para risco de viés Assessing risk of bias in included studies. Chapter 8 hier hier thành kiến risk of bias tool biases hier risk of bias tool hier