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  1. Peptic ulcer - Symptoms and causes - Mayo Clinic

  2. Peptic ulcer - Diagnosis and treatment - Mayo Clinic

  3. Helicobacter pylori (H. pylori) infection - Symptoms & causes

  4. Ulcerative colitis - Symptoms and causes - Mayo Clinic

  5. Mayo Clinic Q and A: How is a peptic ulcer treated?

  6. Solitary rectal ulcer syndrome - Symptoms & causes - Mayo Clinic

  7. duodenal ulcer not caused by Pylori | Mayo Clinic Connect

  8. dudenal ulcer–Pylori? - Mayo Clinic Connect

  9. What causes gastrointestinal bleeding and how serious is it really?

  10. Gastrointestinal bleeding - Symptoms and causes - Mayo Clinic