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  1. Heart disease - Symptoms and causes - Mayo Clinic

  2. About Heart Disease | Heart Disease | CDC

  3. Heart Disease: Types, Causes, and Symptoms - WebMD

  4. Heart Disease: Symptoms & Causes - Cleveland Clinic

  5. What is Cardiovascular Disease? | American Heart Association

  6. Heart Disease Facts - CDC

  7. Heart Disease: Types, Early Signs, Symptoms, Prevention