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The publisher would like to draw the reader's attention to an error in the following article:

T Nomura, Y Inoue and K Nakashima. Pathogenetic heterogeneity of restless legs syndrome in Parkinson's disease. Sleep and Biological Rhythms 2009; 7: 31–33.

This article should have published as Short Paper.

The publisher apologizes for this error and any confusion it may have caused.