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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(a) Impaired QoL was associated with lower tryptophan concentrations (b) and a higher Kyn/Trp ratio (significant in men), (c) while women with an impaired QoL had significantly higher tyrosine concentrations (d) and a lower Phe/Tyr ratio than patients with good QoL.