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  1. The Pittsburgh Sleep Quality Index (PSQI)

  2. The Pittsburgh Sleep Quality Index: a new instrument for

  3. Pittsburgh Sleep Quality Index - Wikipedia

  4. Measures and Study Instruments | The Center for Sleep and …

  5. The Pittsburgh Sleep Quality Index - Physiopedia

  6. Pittsburgh Sleep Quality Index | RehabMeasures Database

  7. Pittsburgh Sleep Quality Index (PSQI) - Mapi Research Trust

  8. Pittsburgh Sleep Quality Index - SpringerLink