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Summary
No abstract available in PubMed .
Keywords:
AmericasClinical ResearchContraceptionContraception FailureContraceptive AgentsContraceptive Agents, FemaleContraceptive MethodsContraceptive Methods--administraction and dosageDeveloped CountriesDeveloping CountriesEconomic FactorsFamily PlanningMacroeconomic FactorsMarketingNorth AmericaNorthern AmericaOral ContraceptivesOral Contraceptives, Combined--administraction and dosageOral Contraceptives, Phasic--administraction and dosagePackagingPearl's FormulaResearch And DevelopmentResearch MethodologyTechnologyUnited States