Operations ResearchModels, AnimalMortalityResearchHospital MortalityInfant MortalityCause of DeathResearch Support as TopicResearch DesignEthics, ResearchResearch PersonnelChild MortalityUnited StatesMaternal MortalityNursing ResearchCohort StudiesRetrospective StudiesTime FactorsHealth Services ResearchTreatment OutcomeFollow-Up StudiesTranslational Medical ResearchProspective StudiesProportional Hazards ModelsSurvival AnalysisRisk AssessmentGenetic ResearchAge FactorsSurvival RateInfant, NewbornCardiovascular DiseasesNeoplasmsIncidencePrognosisRisk FactorsMortality, PrematureSex FactorsClinical Nursing ResearchPerinatal MortalityRegistriesAge DistributionDental ResearchCommunity-Based Participatory ResearchDeath CertificatesSex DistributionMultivariate AnalysisQualitative ResearchPredictive Value of TestsFetal MortalityBehavioral ResearchMorbidity