Full text
PDFPage 489
. 1972 Nov 25;4(5838):489. doi: 10.1136/bmj.4.5838.489-c
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.