Fig. 2.
Percentage of participants (n=486) who reported the characteristic odour at some time each month between May 2007 and August 2008.
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.