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.
Triangulation approach for IV analyses used in this study. The observed association between the IV and the outcome (a) is compared with that expected given the association between the IV and the exposure (b) and the association between the exposure and the outcome (c).
