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  1. Heart disease - Symptoms and causes - Mayo Clinic

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

  3. Heart Disease | cdc.gov

  4. Heart Disease: Symptoms & Causes - Cleveland Clinic

  5. What is Cardiovascular Disease? | American Heart Association

  6. About Heart Disease | cdc.gov

  7. Heart disease - Diagnosis and treatment - Mayo Clinic

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