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  1. Gastrointestinal tract - Wikipedia

  2. Upper GI Series: Definition, Procedure & Tests - Cleveland Clinic

  3. Upper vs. Lower GI Tract: What Are They? - Austin Gastroenterology

  4. Upper GI Tract Anatomy: Overview, Gross Anatomy, Microscopic ... - Medscape

  5. All About the Upper GI Tract - Birmingham Gastroenterology Associates

  6. 18.4: Upper Gastrointestinal Tract - Biology LibreTexts

  7. Upper Gastrointestinal Tract - an overview | ScienceDirect Topics

  8. Upper endoscopy - Mayo Clinic

  9. Physiology, Gastrointestinal - StatPearls - NCBI Bookshelf

  10. Upper Gastrointestinal Tract - ScienceDirect