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.
Square data markers represent odds ratio, with size representing the statistical weight of the study using random-effects analysis. Error bars represent 95% CI. Diamond data marker represents the overall OR and 95% CI for the outcome of interest.
