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We read with interest the study by Simrén et al 1 addressing the correlation between GI symptoms and functional GI disorders (eg, irritable bowel syndrome (IBS)) and the comment by Hadizadeh et al 2 reporting abdominal pain sensation to be associated with an altered faecal microbiota composition. Hadizadeh et al 2 propose from their study on 159 individuals that their results may allow to develop novel tools for diagnosis and management of IBS and dyspepsia. We tried to replicate their findings in the population-based Study of Health in Pomerania (SHIP-Trend)3 using stool samples from 906 volunteers to analyse faecal microbiota composition and diversity by 16S rRNA gene sequencing as previously described.4 Twenty participants were excluded for incomplete phenotypic data or antibiotic treatment at sample collection. Of the remaining 886 individuals (age: 51 years (40–61), median (first to third quartiles); female: 56.4%), 172 (19.4%) reported abdominal pain or discomfort for at least 3 days per month during the last 3 months (cases), whereas 714 did not (controls). To estimate …
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