Full text
PDFPage 60
. 1963 Jan;6(1):60. doi: 10.1901/jeab.1963.6-60
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.