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Environmental MedicineOccupational MedicineOccupational HealthOccupational ExposureOccupational Safety and HealthMortality ExperienceIndustrial MedicineStandardized Mortality RatioMedical SurveillanceLung CancerStatistically SignificantExposureOccupational DiseaseCancer MortalityHealthy Worker EffectCigarette SmokingMedical PracticeCase-Control StudyBladder CancerCauses of Death