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APA Citation
D'Antonio, B., Boyle, J. T., Seewald, M., Giller, J., Muench, A., Vargas, I., Williams, N. J., Klingman, K., & Perlis, M. L. (n.d.). 0153 Patient-Defined Insomnia Severity: How Much Wakefulness is Problematic?. Sleep, 43, A60–A61. http://access.bl.uk/ark:/81055/vdc_100116587508.0x00003e