Full text
PDFPage 1017-1020
. 1982 Apr 3;284(6321):1019–1020. doi: 10.1136/bmj.284.6321.1019
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.