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Clinical outcomes. The mean 22-item Sinonasal Outcome Test (SNOT-22 )total score, visual analogue scale (VAS), nasal polyp score (NPS), and Sniffin Sticks-16 items identification test (SS-I) at T0, T3 and T6. * Statistical significance. T0: baseline; T3: 3 months follow-up; T6: 6 months follow-up.
