Both Stimulatory and Inhibitory Effects of Dietary 5-Hydroxytryptophan and Tyrosine are Found on Urinary Excretion of Serotonin and Dopamine in a Large Human Population [Expression of Concern]
Authors Trachte G, Uncini T, Hinz M
Received 14 April 2020
Accepted for publication 14 April 2020
Published 23 April 2020 Volume 2020:16 Pages 1069—1070
Trachte G, Uncini T, Hinz M. Neuropsychiatr Dis Treat. 2009;5:227– 235.
The Editor-in-Chief and Publisher of Neuropsychiatric Disease and Treatment wish to issue an Expression of Concern for the published article.
Concerns have been raised regarding the alleged undisclosed competing interests of some of the authors, and the level of information provided on methodology, study data and process of institutional ethical approval for the published article. Neuropsychiatric Disease and Treatment would like to alert readers of this while our investigation is still ongoing and we will provide an update following the conclusion of our investigation.
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