This is a clinical study in children and adolescents (5-17 years) with allergy to pollen from birch (or related trees). It compares the tree SLIT-tablet with placebo in relieving rhinoconjunctivitis symptoms during the birch/tree pollen season based on the average allergic rhinoconjunctivitis daily total combined score. The study will also collect health-related quality of life information in the groups treated with the tree SLIT-tablet or with placebo during the pollen season. The trial medication used is already approved to treat allergic rhinitis caused by birch/tree pollen in adults in several countries?.
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Average Total Combined Score (TCS) During the Birch Pollen Season (BPS)
Timeframe: During the BPS (mean duration of approximately 3-4 weeks)