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American Cancer Society:  www.cancer.org/

American Society for Gastrointestional Endoscopy:   www.asge.org/

American Gastroenterological Association:  www.gastro.org/

American Liver Foundation:  www.liverfoundation.org/

The Crohn's and Colitis Foundation of America:  www.ccfa.org/

Hepatitis C Advocate: www.HCVadvocate.org

The Mayo Clinic: www.mayoclinic.com/

Celiac Sprue Association: www.csaceliacs.org/

Web MD:  www.webmd.com/