Excellent IBS Overview by John Hopkins Gastroenterology and Hepatology
http://www.hopkins-gi.org/GDL_Disease.aspx?CurrentUDV=31&GDL_Disease_id=F5E21D6B-A88E-44F9-900F-7E295C50D38B&GDL_DC_id=D03119D7-57A3-4890-A717-CF1E7426C8BA