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Behavioral Risk Factor Surveillance SystemData CollectionSurvey MethodologyPopulation HealthSurvey ResearchResponse RateInformation Technology StaffRespondent Driven SamplingProportional DifferenceMode of Data CollectionGeographic ParametersEthnic Minority PopulationsSocial Security AdministrationRespondent-Driven SamplingHealth Care SurveyPOPULATION SURVEILLANCEMode ExperimentCell Phone DataSexual Minority WomenStandard Instruments