1. Drossman DA. Characterization of intestinal function and diagnosis of irritable bowel syndrome by surveys and questionnaires. Gastroenterol Clin Biol. 1990;14:37C–41.
2. Whitehead WE, Corazziari E, Prizont R, Senior JR, Thompson WG, Veldhuyzen Van Zanten SJ. Definition of a responder in clinical trials for functional gastrointestinal disorders: report on a symposium. Gut. 1999;45 Suppl 2:II78–9.
3. Thompson WG, Longstreth GF, Drossman DA, Heaton KW, Irvine EJ, Muller-Lissner SA. Functional bowel disorders and functional abdominal pain. Gut. 1999;45 Suppl 2:II43–7.
4. Ford AC, Bercik P, Morgan DG, Bolino C, Pintos-Sanchez MI, Moayyedi P. Validation of the Rome III criteria for the diagnosis of irritable bowel syndrome in secondary care. Gastroenterology. 2013;145(1262–1270):e1261.
5. Markland AD, Palsson O, Goode PS, Burgio KL, Busby-Whitehead J, Whitehead WE. Association of low dietary intake of fiber and liquids with constipation: evidence from the National Health and Nutrition Examination Survey. Am J Gastroenterol. 2013;108:796–803.