Full text
PDFPage 1799
letter . 1983 Dec 10;287(6407):1799. doi: 10.1136/bmj.287.6407.1799-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.