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Nakos G, Karagiannis S, Ballas S, Galanis P, Alevizopoulos G, Nakos A, Mavrogiannis C. A study comparing tolerability, satisfaction and acceptance of three different techniques for esophageal endoscopy: sedated conventional, unsedated peroral ultra thin, and esophageal capsule. Diseases of the Esophagus. 2009;22(5):447-452.\par \par }