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.
Risk of bias assessments of (A) included cluster-randomised trials, performed using the Cochrane Risk of Bias 2 tool for Cluster-Randomised Trials and (B) included non-randomised studies, performed using the Cochrane Risk of Bias in Non-randomized Studies of Interventions tool.
