Dopaminergic modulation of emotional conflict in Parkinson's disease.

Front Aging Neurosci · 2014 · PMC4107849 · PMID 25100991

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highly significantno p-value reported

Each patient served as his own control, meaning that differences between drug-on and drug-off state may be highly significant in relatively small samples.

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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.