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Backhaus, J., Junghanns, K., Broocks, A., Riemann, D. and Hohagen, F. (2002) Test-Retest Reliability and Validity of the Pittsburgh Sleep Quality Index in Primary Insomnia. Journal of Psychosomatic Research, 53, 737-740.
https://doi.org/10.1016/S0022-3999(02)00330-6

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