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Background Environmental and genetic factors contribute to variation in irritable bowel syndrome (IBS), anxiety and depression. Comorbidity between these disorders is high. A previous investigation of our population-based twin cohort revealed that low birth weight increased the risk for development of IBS, with environmental influences in utero as the most relevant contributing factor. We hypothesise...
Two thousand five hundred seventy pairs of Norwegian MZ and like-sexed and unlike-sexed DZ twins aged 18–25 years completed questionnaires with information about symptoms of anxiety and depression and alcohol consumption. The aim of the study was to estimate sex-specific genetic and environmental effects unique to symptoms of anxiety/depression and to alcohol consumption and effects common to the...
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