Mirror image--the care of the professional voice.
Davies
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DG
D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D020704:Laryngoscopes / Q000266:history; D007828:Laryngoscopy / Q000266:history; D009146:Music / Q000266:history / Q000523:psychology; D009784:Occupational Diseases / Q000209:etiology; D014831:Voice; D014832:Voice Disorders / Q000209:etiology