National Institute of Health (NIH) :
http://digestive.niddk.nih.gov/ddiseases//a-z.asp

American Gastroenterological Association (AGA) :
www.gastro.org/wmspage.cfm?parm1=478

American College of Gastroenterology (ACG) :
www.acg.gi.org/patients

Crohn's and Colitis Foundation of America (CCFA) :
www.ccfa.org/info/?LMI=4

American Society for Gastrointestinal Endoscopy (ASGE) :
http://www.asge.org/patientinfoindex.aspx?id=1022

American Liver Foundation :
www.liverfoundation.org

Celiac Disease Foundation :
www.celiac.org

WebMD Health :
http://my.webmd.com/content/article/90/100601.htm

American Dietetic Association :
www.eatright.org