AST is an organization of transplant professionals dedicated to research, education, advocacy and patient care in transplantation science and medicine.

The Celiac Disease Foundation is a non-profit, public benefit corporation dedicated to providing services and support regarding celiac disease and dermatitis herpetiformis.

NDDIC provides information about digestive diseases, statistics, research and more, from the National Institute of Diabetes and Digestive and Kidney Diseases.

NIDDK is a branch of the National Institutes of Health that offers health and research information about a variety of digestive diseases that can affect the liver.