Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Summary of risk of bias for each included trial assessed by the revised Cochrane risk‐of‐bias tool (RoB2). With this tool, the risk of bias of each included study is judged according to five domains (D1–D5) and overall, as “low risk”, “some concerns”, or “high risk”.
