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Upper Endoscopy: What Is It, Who Needs It, Risks & Benefits
Upper endoscopy - Mayo Clinic
Upper GI Endoscopy - Johns Hopkins Medicine
Esophagogastroduodenoscopy (EGD Test) - Cleveland Clinic
Upper GI Endoscopy (EGD): Procedure Details and Recovery
Patient education: Upper endoscopy (Beyond the Basics)
Upper GI Endoscopy - NIDDK