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|  | The Anatomical Therapeutic Chemical (ATC) classification system |  | 
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 Level 1
 
 B - Blood and blood forming organs
 
 B01 - Antithrombotic agentsB02 - AntihemorrhagicsB03 - Antianemic preparationsB05 - Blood substitutes and perfusion solutionsB06 - Other hematological agents
 
 
 
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