CadmiumCadmium PoisoningCadmium ChlorideCadmium CompoundsEnvironmental ExposureEnvironmental PollutantsMetallothioneinFood ContaminationCrassostreabeta 2-MicroglobulinMetallurgySpectrophotometry, AtomicEnvironmental MonitoringAcetylglucosaminidaseLeadWater Pollutants, ChemicalGillsCadmium RadioisotopesZincNutrition SurveysDietKidney DiseasesKidneyOccupational ExposureCreatinineOccupational DiseasesSmokingSwedenDose-Response Relationship, DrugMetals, HeavyLiverBiological MarkersUnited StatesPhytochelatinsTime FactorsMultivariate AnalysisCross-Sectional Studies