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The Anatomical Therapeutic Chemical (ATC) classification system
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Level 4
G - Genito urinary system and sex hormonesG02 - Other gynecologicalsG02B - Contraceptives for topical useG02BA - Intrauterine contraceptives
G02BA01 - Plastic IUDG02BA02 - Plastic IUD with copperG02BA03 - Plastic IUD with progestogen
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