MercuryMercury PoisoningMercury CompoundsMercury Poisoning, Nervous SystemMethylmercury CompoundsDental AmalgamDental AssistantsFood ContaminationHairSeafoodUnithiolMercuric ChlorideEnvironmental ExposureDentistsFishesDental StaffMiningBleaching AgentsThimerosalSuccimerSeychellesHeavy Metal Poisoning, Nervous SystemCosmeticsEnvironmental PollutantsEthylmercury CompoundsBody BurdenWater Pollutants, ChemicalSpectrophotometry, AtomicPreservatives, PharmaceuticalEnvironmental MonitoringMercury IsotopesOccupational ExposureEpidemiological MonitoringMaternal ExposureDental Restoration, PermanentGoldPoison Control CentersOrganomercury CompoundsChild DevelopmentSeleniumAir Pollutants, OccupationalPrenatal Exposure Delayed EffectsNervous SystemVolatilizationMercury RadioisotopesPregnancyDietBrazilBiological MarkersTime FactorsCross-Sectional Studies