Full text
PDFPage 746
letter . 1982 Mar 6;284(6317):746. doi: 10.1136/bmj.284.6317.746-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.