Understanding the role of serotonin in psychiatric diseases.

F1000Res · 2017 · PMC5325064 · PMID 28299200

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Unfortunately, the 5-HT dysfunctions widely described with different tools are not detected in all patients, and the non-response rate to serotonergic drugs is still quite significant (around 50% of the cases), and only 30% reach effective remission 18 .

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.