title: Clinical evaluation of interval contraception by norethindrone acetate implant.
mesh_terms: D000293:Adolescent; D000328:Adult; D003267:Contraception / Q000379:methods*; D004343:Drug Implants; D005260:Female; D006801:Humans; D009640:Norethindrone / Q000008:administration & dosage* / Q000494:pharmacology; D011247:Pregnancy; D012826:Silicone Elastomers / Q000008:administration & dosage*; D013997:Time Factors
chemical_list: D004343:Drug Implants; D012826:Silicone Elastomers; D009640:Norethindrone