Background

Many diseases are associated with specific chemical alterations; these alterations are commonly called biomarkers and are routinely used to determine if a medical event or process will occur, is occurring, or has occurred. While they may be indirect, the interest in identifying chemical measurements that can be used as biomarkers is very high. This is especially true for conditions that currently do not have diagnostic biomarkers, such as mood and hyperactivity disorders. Chemicals like neurotransmitters, which change in a predictable manner and parallel ...

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