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Change in acoustic parameters after provocation with Allerkin (Lofarma) house dust mite extract. Group A: non-allergic group, group B: allergic group, group C: local allergic group. Kruskal-Wallis and Mann-Whitney U-tests. TNV, total nasal volume; MCA, minimal cross-sectional area; _15 min, 15 minutes after challenge; _30 min, 30 minutes after challenge.
