AUC-ROC	Area under the receiver operator characteristic curve
CDC	Centers for Disease Control
CI	Confidence interval
CNS	Central nervous system
CSF	Cerebrospinal fluid
GC-MS	Gas chromatography–mass spectrometry
p-HBA	4-hydroxybenzoic acid
5HIAA	5-hydroxyindole-3-acetic acid
p-HPhAA	4-hydroxyphenylacetic acid
p-HPhLA	4-hydroxyphenyllactic acid
p-HPhPA	4-hydroxyphenylpropionic acid
3IAA	Indole-3-acetic acid
3ICA	Indole-3-carboxylic acid
IL-6	Interleukin-6
3IPA	Indole-3-propionic acid
3ILA	Indole-3-lactic acid
LLOQ	Lower limit of quantitation
NSE	Neuron-specific enolase
PCR	Polymerase chain reaction
PhPA	3-phenylpropionic acid
PhLA	3-phenyllactic acid
SHAP	SHapley Additive exPlanations
UPLC-MS/MS	Ultra-high-pressure liquid chromatography–tandem mass spectrometry