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  1. Heart Block: Types, Symptoms & Causes - Cleveland Clinic

  2. Heart Block: Causes, Symptoms, Disgnosis, Treatment - WebMD

  3. Heart Block - Johns Hopkins Medicine

  4. Heart block - Wikipedia

  5. Heart Block: Types, Causes, Symptoms, Treatment - Healthline

  6. Heart Block: Types, Causes, Symptoms, and Risk Factors

  7. Heart block: Types, causes, symptoms, and risk factors

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