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Development and psychometric evaluation of the patient assessment of upper gastrointestinal symptom severity index (PAGI-SYM) in patients with upper gastrointestinal disorders

Functional Gastrointestinal DisorderPsychiatryUpper Gastrointestinal DisordersDiagnostic CriterionGastroenterologyDiagnosisPatient AssessmentPsychometric EvaluationMedicine