In Kessler RC, Berglund PA, Coulouvrat C., Hajak G., Roth T., Shahly V, Shillington AC, Stephenson JJ and Walsh JK: Insomnia and the performance of US workers: results from the America Insomnia Survey. Sleep 2011;34:1161–71 my colleagues and I inadvertently failed to include the reference for the especially noteworthy study that was mentioned on page 1168, left column, second paragraph:
The sentence: “A large (n = 37,302) prospective Norwegian study is especially noteworthy in that it calculated the PARP of baseline insomnia predicting subsequent disability pension claims controlling for a number of comorbid conditions.” should have referenced Overland S et al: A comparison of insomnia and depression as predictors of disability pension. The HUNT Study. Sleep;2008:31(6):875–880.