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HPLC was performed using a 474 fluorescence detector (Waters 2690 Separations Module

Exclusion criteria for all groups included current or previous psychiatric comorbidities as diagnosed by DSM-5, using a structured interview (The Structured Clinical Interview for DSM-5, SCID-5) [28] if deemed relevant by the investigator, any general medical conditions known to influence energy processing and/or linked to fatigue, current treatment with any medication/supplementation likely to interfere with energy metabolism if deemed relevant by the investigator, contra-indications to magnetic resonance (MR) imaging, pregnancy or breast feeding