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Level 3
R - Respiratory systemR03 - Drugs for obstructive airway diseasesR03B - Other drugs for obstructive airway diseases, inhalants
R03BA - GlucocorticoidsR03BB - AnticholinergicsR03BC - Antiallergic agents, excluding corticosteroidsR03BX - Other drugs for obstructive airway diseases, inhalants
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