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Improving depression severity assessment—I. Reliability, internal validity and sensitivity to change of three observer depression scales

PsychiatryMood SymptomMedicineClinical PsychologyPsychologyDepressionDepression Severity Assessment—iSocial SciencesMood DisordersPsychiatric DisorderMental HealthClassical Test TheoryDepression ScalesInternal ValidityMood SpectrumPsychopathology