The links below will provide you with additional information for reliable sources: American Gastroenterological Association (AGA) www.gastro.org American Society for Gastrointestinal Endoscopy (ASGE) www.asge.org American College of Gastroenterology (ACG) www.gi.org Crohn’s and Colitis Foundation of American (CCFA) www.ccfa.org American Cancer Society www.cancer.org American Liver Foundation www.liverfoundation.org GERD Information Resource Center www.gerd.com Celiac Disease Foundation www.celiac.org Hepatitis B Foundation www.hepb.org Hepatitis C Information Center www.hepatitis-central.com Irritable Bowel Syndrome Self Help and Support Group www.ibsgroup.org National Cancer Institute www.cancer.gov