Full text
PDF
editorial . 1990 Nov;54(3):159–162. doi: 10.1901/jeab.1990.54-159
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.