Figure 1.
Consolidated Standards of Reporting Trials diagram. Participant recruitment, screening, and group assignment. E-cigarette = electronic-cigarette.
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.