Psychometric validation of symptom severity measures in irritable bowel syndrome with constipationValerie Williams, J. Martin Johnston, Richard T. Carson et al.|Alimentary Pharmacology & Therapeutics|2014Cited by 8
Psychometric validation of patient-reported outcome measures assessing chronic constipationValerie Williams, Lauren Nelson, Sheri Fehnel et al.|Clinical and Experimental Gastroenterology|2014Cited by 4