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Groven N, Reitan SK, Fors EA, Guzey IC. Kynurenine metabolites and ratios differ between Chronic Fatigue Syndrome, Fibromyalgia, and healthy controls. Psychoneuroendocrinology. 2021 Sep;131:105287. doi: 10.1016/j.psyneuen.2021.105287. Epub 2021 May 27. PMID: 34090138. Abstract