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background throat nose blue ear ent specialist otolaryngology hearing loss sinus infection nasal congestion sore tinnitus infections snoring voice disorders sleep apnea test allergy testing chronic sinusitis balance wax removal tonsillitis head neck surgery swimmer's deviated septum eardrum repair vocal cord issues polyps conditions headache vertigo treatment earache relief endoscopy pediatric pain cleaning consultation aids stuffy laryngitis pressure bleeds hoarseness study problems blockage drum perforation cancer facial swallowing difficulties endoscopic restoration care