Figure 1.
Schematic of the study design. Vertical arrows indicate the days of fecal sample collection (when defecation occurred) from volunteers.
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.