1. Talley NJ, Gabriel SE, Harmsen WS, Zinsmeister AR, Evans RW. Medical costs in community subjects with irritable bowel syndrome. Gastroenterology. 1995;109:1736–41.
2. Spiegel B, Bolus R, Harris LA, et al. Measuring irritable bowel syndrome patient-reported outcomes with an abdominal pain numeric rating scale. Aliment Pharmacol Ther. 2009;30:1159–70.
3. Remes-Troche J, Bernal-Reyes R, Valladares-Lepine M, Alonso-Larraga O, Gomez-Escudero O, Melendez-Mena D. Gastroenterology diagnosis and treatment guidelines of irritable bowel syndrome; clinical features and diagnostic criteria. Rev Gastroenterol Mex. 2009;74:58–62.
4. Quigley EM, Sperber AD, Drossman DA. WGO-Rome foundation joint symposium summary: IBS-the global perspective. J Clin Gastroenterol. 2011;45:i–ii.
5. Longstreth GF, Thompson WG, Chey WD, Houghton LA, Mearin F, Spiller RC. Functional bowel disorders. Gastroenterology. 2006;130:1480–91.