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The Anatomical Therapeutic Chemical (ATC) classification system
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Level 3
  
B - Blood and blood forming organsB01 - Antithrombotic agentsB01A - Antithrombotic agents
  
B01AA - Vitamin K antagonistsB01AB - Heparin groupB01AC - Platelet aggregation inhibitors excluding heparinB01AD - EnzymesB01AE - Direct thrombin inhibitorsB01AX - Other antithrombotic agents
  
 
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