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This issue devoted to Esophageal Function Testing highlights these tests that are complimentary to endoscopy and should be considered after endoscopy is performed. In fact, a prerequisite for performing many of these studies is a negative endoscopy and thus, the endoscopist should be well-informed regarding the indication and utility of these tests. Additionally, some of these newer technologies require endoscopy to be performed during the study as the placement or positioning of the measurement tool will require endoscopic landmarks or direct placement. There have been major advances in most...