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Serotonin, its key metabolite hydroxyindole acetic acid (5-HIAA) and dopamine have been shown to be potential biomarkers whose levels in serum and urine can be correlated with certain psychiatric and physiological disorders and illness, including depression, schizophrenia, anxiety and dementia. Recently we have published elsewhere that 5-HIAA has been identified as a potential biomarker for Attention...
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