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Level 3
R - Respiratory System
R03 - Drugs for Obstructive Airway Diseases
R03B - Other Drugs for Obstructive Airway Diseases, Inhalants
R03BA - Glucocorticoids
R03BB - Anticholinergics
R03BC - Antiallergic agents, excl. corticosteroids
R03BX - Other drugs for obstructive airway diseases, inhalants
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