American Heart Association

American Association for the Advancement of Science

  American College of Cardiology

American Medical Association

Bexar County Medical Society

Cardiology on the Web

The Heart (Online Exploration)

Yahoo! Health

Heart Failure Online

Heart Disease Information

Cardiovascular Disease News and Information

The Society for Cardiovascular Angiography and Interventions

American Diabetes Association

American Dietetic Association

theHeart.org: Trusted Cardiology News and Opinions