Fig 2.
(A) Risk of bias graph: Review authors’judgements about each risk of bias item presented as percentages across all included studies, (B) Risk of bias summary: Review authors’ judgements about each risk of bias item for each included study.
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.