https://www.selleckchem.com/pr....oducts/abc294640.htm
Background and study aims  Patients with esophageal squamous cell carcinoma (SCC) are at high risk of developing second primary SCCs in the hypopharynx. However, such second primary tumors are difficult to observe because of lumen closure. The Valsalva maneuver using a dedicated mouthpiece is a promising technique to visualize the hypopharynx during transoral endoscopy. In the current study, we investigated the utility of this method. Patients and methods  The current study was a randomized, controlled, crossover trial. Patients with

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