Nontherapeutic Human ExperimentationResearch SubjectsRisk FactorsResearchResearch Support as TopicResearch DesignEthics, ResearchResearch PersonnelNursing ResearchPrevalenceCase-Control StudiesCardiovascular DiseasesIncidenceHealth Services ResearchUnited StatesTranslational Medical ResearchProspective StudiesCohort StudiesLogistic ModelsAge FactorsCross-Sectional StudiesRisk AssessmentSmokingRetrospective StudiesGenetic ResearchMultivariate AnalysisOdds RatioQuestionnaires