Full Text
The Full Text of this article is available as a PDF (596.5 KB).
. 1986;8(4):167–169. doi: 10.1155/S1463924686000329
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.