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Level 3
C - Cardiovascular systemC01 - Cardiac therapyC01B - Antiarrhythmics, class I and III
C01BA - Antiarrhythmics, class IaC01BB - Antiarrhythmics, class IbC01BC - Antiarrhythmics, class ICC01BD - Antiarrhythmics, class IIIC01BG - Other class I antiarrhythmics
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