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Level 4
R - Respiratory systemR03 - Drugs for obstructive airway diseasesR03B - Other drugs for obstructive airway diseases, inhalantsR03BB - Anticholinergics
R03BB01 - Ipratropium BromideR03BB02 - Oxitropium BromideR03BB03 - Stramoni preparationsR03BB04 - Tiotropium Bromide
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