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Urine is often used for biomonitoring the exposure to elements. However, most studies report concentrations in spot urine samples, which may not accurately mirror the "gold standard" of complete 24-h (24h) urine samples. There are relatively few data published for 24h samples, and little information on the within- and between person variability. The present study aimed at assessing variability within and between individuals in 24h excretion for a number of elements in adults from the general population and the typical 24h excretion of th