Full text
PDFPage 57
letter . 1979 Jan 6;1(6155):57. doi: 10.1136/bmj.1.6155.57-b
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.