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.
In Atherton et al. (2008), in Fig. 2 the labels A1, A2, B1, B2 and B3 should read Aa, Ab, Ba, Bb and Bc, respectively.
