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Walsh, J.K., Coulouvrat, C., Hajak, G., Lakoma, M.D., Petukhova, M., Roth, T., et al. (2011) Nighttime Insomnia Symptoms and Perceived Health in the America Insomnia Survey (AIS). Sleep, 34, 997-1011.
https://doi.org/10.5665/SLEEP.1150

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