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  1. Heart disease - Symptoms and causes - Mayo Clinic

  2. Heart Disease Facts | cdc.gov

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

  4. Heart Disease | cdc.gov

  5. What is Cardiovascular Disease? | American Heart Association

  6. Heart Disease: Symptoms & Causes - Cleveland Clinic

  7. Heart Disease: Risk Factors, Prevention, and More - Healthline

  8. Coronary artery disease - Symptoms and causes - Mayo Clinic

  9. Heart disease - Diagnosis and treatment - Mayo Clinic

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