?:definition
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Pittsburgh Sleep Quality Index (PSQI) (Copyright 1989, University of Pittsburgh. Buysse,D.J., Reynolds,C.F., Monk,T.H., Berman,S.R., & Kupfer, D.J. The Pittsburgh Sleep Quality Index (PSQI): A new instrument for psychiatric practice and research. Psychiatry Research, 1989, 28(2):193-213).
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