Figure 2. Summary of risks (bias appraisal).
A summary of risks across studies based on author rating: low, unclear, or high risk of bias (see Appendix D for details).
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.