Full Text
The Full Text of this article is available as a PDF (120.9 KB).
. 1997 Fall;30(3):573–575. doi: 10.1901/jaba.1997.30-573
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.