Full Text
The Full Text of this article is available as a PDF (10.1 MB).
. 1990 Sep;5(3):117–126. doi: 10.3346/jkms.1990.5.3.117
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.