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PDFPage 255
. 1959 Apr;52(4):255. doi: 10.1177/003591575905200405
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.
