Development of the Diary for Irritable Bowel Syndrome Symptoms to Assess Treatment Benefit in Clinical Trials: Foundational Qualitative Research☆
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Keywords
content validity
irritable bowel syndrome
patient-reported outcome measures
symptoms
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Conflicts of interest: S. E. Fehnel and C. M. Ervin are employees of RTI Health Solutions. R. T. Carson is an employee of Allergan plc and owns stock and stock options in Allergan plc. G. Rigoni was an employee of Takeda at the time of this study.
© 2016 International Society for Pharmacoeconomics and Outcomes Research (ISPOR). Published by Elsevier Inc.