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RV95s for urinary mercury, cadmium and lead in Riyadh examples expressed in μg/l (μg/g creatinine) had been 2.5 (1.9), 1.2 (0.96) and 14 (10.8), respectively. Values in both matrices remained high even if possible aspects such as secondhand smoking, dental amalgam, and/or fish consumption excluded. RV95s for metals in blood had been typically higher than in other countries, with the exception of mercury in Riyadh samples, that was also 4-fold lower than in Al-Kharj. But, as a result of the time-lag involvin