Full text
PDFPage 566
letter . 1986 Aug 30;293(6546):566. doi: 10.1136/bmj.293.6546.566
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.