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Background. Graham et al. [Lancet, I (1987) 1174] found a late increase of 13 C enrichment in the 13 C-urea breath test 120 min after administration of labeled urea to patients without Helicobacter pylori infection. This may give false positive results.Aim. We designed this study to elucidate the contribution of the gastrointestinal tract below the stomach to the 1 ...
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