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Abstract
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Keywords:
Clinical ResearchContraceptionContraceptive AgentsContraceptive Agents, EstrogenContraceptive Agents, FemaleContraceptive Agents, ProgestinContraceptive MethodsCytologic EffectsEndometrial EffectsEthinyl EstradiolFamily PlanningHistologyMegestrol AcetateMenstruationMenstruation DisordersOral ContraceptivesOral Contraceptives, CombinedResearch Methodology