Fig. 5.
Age at which data was collected from each of 54 participants. Close or overlapping points indicate reliability acquisitions closely spaced in time.
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.