The results of an assessment for bias in accordance with Hayden's criteria.

Unsure: not enough information to evaluate.
Low, low risk of bias; moderate, moderate risk of bias; high, high risk of bias.
*One of the domains was assessed as “unsure” due to unavailable information even after the authors were contacted.

不确定：信息不足，无法开展评估。
低：低偏倚风险（risk of bias）；中：中偏倚风险（risk of bias）；高：高偏倚风险（risk of bias）。
*因即便联系了原作者仍无法获取相关信息，其中一个评估维度被判定为"不确定"。