Figure 1.
Annual and cumulative numbers of publications across comparison groups
Long, longitudinal; R01, NIH Research Project Grant Program; TTURC, Transdisciplinary Tobacco Research Use Center
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.