American Liver Foundation
http://www.liverfoundation.org/

American Association for the Study of Liver Diseases
http://www.aasld.org/

American Digestive Health Foundation
http://www.gastro.org/

American Gastroenterological Association
http://www.gastro.org/

American Society for Gastrointestinal Endoscopy
http://www.asge.org/

British Colostomy Assocation
http://www.digestivedisorders.org.uk/

British Digestive Diseases Foundation
http://www.digestivedisorders.org.uk/

Centre for Gastroenterology
http://www.gastrohep.com/

Gastroenterological Society of Australia
http://www.gesa.org.au/

National Cancer Institute (NIH)
http://www.nci.nih.gov

National Library of Medicine (Medline) - PubMed
http://www.ncbi.nlm.nih.gov/PubMed/

New England Journal of Medicine
http://nejm.org/

NIDDK - National Institutes of Health, USA
http://www.niddk.nih.gov

Royal Australasian College of Physicians
http://www.racp.edu.au/index.htm