1. Text Book of Gastroenterology. 4th ed;Yamada,2003
2. Harrison's Principles of Internal Medicine. 16th ed;Owyang,2005
3. IBS—review and what's new;Foxx-Orenstein;Med Gen Med,2006
4. Sleisenger and Fordtran's Gastrointestinal and Liver Disease: Pathophysiology, Diagnosis, Management. 7th ed;Feldman,2002
5. The interface of psychiatry and irritable bowel syndrome;Folks;Curr Psychiatry Rep,2004