Grading Chronic Pain Severity - Revised (GCPS-R)FREE for use with an Inquisit Lab or Inquisit Web license.
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Von Korff, M.; DeBar, L.L.; Krebs, E.E,c; Kerns, R.D.; Deyo, R.A; Keefe, F.J.(2020). Graded chronic pain scale revised: mild, bothersome, and high-impact chronic pain. PAIN,161,651-661.