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Abstract
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Keywords:
AmenorrheaBiologyClinical ResearchContraceptionContraceptive Agents, FemaleContraceptive Agents, ProgestinContraceptive Agents--side effectsDeveloped CountriesDiseasesEndocrine SystemEthynodiol Diacetate--side effectsEuropeFamily PlanningGenital Effects, FemaleGenitaliaGenitalia, FemaleHormonesMenstruation DisordersNorethindrone--side effectsNorgestrel--side effectsNorthern EuropePhysiologyReproductive Control AgentsResearch MethodologyUnited KingdomUrogenital EffectsUrogenital System