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PDFPage 404
letter . 1964 Jul;48(7):404. doi: 10.1136/bjo.48.7.404
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.