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WikiPedia: Mất_giọng https://www.allaboutcounseling.com/library/aphonia... https://www.botanical-online.com/Aphonia.htm https://books.google.com/?id=Xjk_AwAAQBAJ&pg=PA162... https://www.healthgrades.com/symptoms/loss-of-voic... https://web.archive.org/web/20171216201303/https:/...