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Birkner, B.; Fritz, N.; Schatke, W.; Hasford, Joerg (2003): A prospective randomized comparison of unsedated ultrathin versus standard esophagogastroduodenoscopy in routine outpatient gastroenterology practice: does it work better through the nose? In: Endoscopy, Vol. 35, No. 8: pp. 647-651
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