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Buysse, D. J., Iii, C. F. R., Monk, T. H., Berman, S. R., & Kupfer, D. J. (1989). The Pittsburgh Sleep Quality Index: A New Instrument for Psychiatric Practice and Research. Psychiatry Research, 28, 193-213. https://doi.org/10.1016/0165-1781(89)90047-4

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