Full text
PDFPage 1042
letter . 1994 Oct;49(10):1042. doi: 10.1136/thx.49.10.1042-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.