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Background and Aim: Biopsy specimens are taken during transnasal esophagogastroduodenoscopy with 1.8 mm forceps. The aims of this study were to compare the concordance of the Campylobacter‐like organism (CLO) test and histological diagnoses between biopsies taken with 1.8 mm and 2.2 mm forceps and to determine whether the concordance of the CLO test could be improved by increasing the number of specimens...