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 Level 4
 
 C - Cardiovascular systemC07 - Beta blocking agentsC07F - Beta blocking agents and other antihypertensivesC07FB - Beta blocking agents, selective, and other antihypertensives
 
 C07FB02 - Metoprolol and other antihypertensivesC07FB03 - Atenolol and other antihypertensivesC07FB07 - Bisoprolol and other antihypertensives
 
 
 
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