Full text
PDFPage 81
. 1953 Jan 10;1(4801):81. doi: 10.1136/bmj.1.4801.81
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.
