Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

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.

View full-text article in PMC

. 2012 Jun;32(3):158–163.

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© Copyright by Società Italiana di Otorinolaringologia e Chirurgia Cervico-Facciale

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives License, which permits for noncommercial use, distribution, and reproduction in any digital medium, provided the original work is properly cited and is not altered in any way. For details, please refer to http://creativecommons.org/licenses/by-nc-nd/3.0/

PMC Copyright notice

graphic file with name 0392-100X-32-158-g00A.jpg