Official websites use .gov
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.gov website belongs to an official
government organization in the United States.
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A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Reproduced with permission Anastasi et al. AA VV, Anatomia dell’uomo, fourth edition, 2010, pp76. Editor: Edi-Ermes, Milano [Human Anatomy].
