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Abstract
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Keywords:
AdolescentsContraception, ImmunologicalContraception--beneficial effectsContraceptive AgentsContraceptive Agents, FemaleContraceptive EffectivenessContraceptive Methods--beneficial effectsEconomic FactorsFamily PlanningFertility Control, PostcoitalOral Contraceptives--beneficial effectsPerfect ContraceptivesResearch And DevelopmentTechnologyTheoretical Effectiveness