EntityQ961652· pop 21· linked from 429 articlescase-control studySign in to savetype of observational study comparing two existing groups differing in outcomeConnectionsprevalenceEntityrandomized controlled trialEntityincidenceEntityrelative riskEntitydiseaseEntityWorld Health OrganizationEntityInternational Standard Book NumberEntitysexually transmitted infectionEntityepidemicEntitypollutionEntityvaccinationEntitydigital object identifierEntityhygieneEntityInternational Standard Serial NumberEntityair pollutionEntityexperimentEntityepidemiologyEntitysocial psychologyEntityquarantineEntitymental healthEntityCategoriesDesign of experimentsEpidemiologyNursing research