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.
Data are represented as means±SEM. Significant differences among the months are indicated (*p<0.05 by one-way ANOVA following Tukey's test).
