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  1. Bronchitis - Symptoms and causes - Mayo Clinic

  2. Bronchitis - Diagnosis and treatment - Mayo Clinic

  3. Acute bronchitis: Is it contagious? - Mayo Clinic

  4. Bronchitis - Mayo Clinic

  5. Bronchiolitis - Symptoms and causes - Mayo Clinic

  6. Bronchiolitis - Diagnosis and treatment - Mayo Clinic

  7. Bronquitis - Síntomas y causas - Mayo Clinic

  8. 支气管炎 - 症状与病因 - 妙佑医疗国际 - Mayo Clinic

  9. Coughing up blood Causes - Mayo Clinic

  10. Bronchitis: Cough it Up! - Mayo Clinic News Network