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 Level 3
 
 H - Systemic hormonal preparations, excluding sex hormones and insulinsH03 - Thyroid therapyH03B - Antithyroid preparations
 
 H03BA - ThiouracilsH03BB - Sulfur-containing imidazole derivativesH03BC - PerchloratesH03BX - Other antithyroid preparations
 
 
 
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