Figure 1.
Flow diagram of the progress through the phases of a parallel randomized trial of two groups (that is, enrollment, intervention allocation, follow-up, and data analysis).
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.