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 Level 3
 
 B - Blood and blood forming organsB03 - Antianemic preparationsB03A - Iron preparations
 
 B03AA - Iron bivalent, oral preparationsB03AB - Iron trivalent, oral preparationsB03AC - Iron trivalent, parenteral preparationsB03AD - Iron in combination with Folic Acid B03AE - Iron in other combinations
 
 
 
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