Progressive development of augmentation during long-term treatment with levodopa in restless legs syndrome: results of a prospective multi-center study.

J Neurol · 2010 · PMC3085743 · PMID 19756826

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marginally significantno p-value reported

In addition, low serum ferritin level has been found in two independent previous studies to be a risk factor for augmentation [ 10 , 24 ] and the association was marginally significant in our study.

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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.