| intestinal microbiota and its effect on the immune system--a nested case-cohort study on prevention of atopy among small children in trondheim: the impact study. | background: in the past 20-30 years, the prevalence of atopic diseases, particularly among children in the western world, has increased. it has been suggested that western lifestyle may have reduced the overall exposure to microbial stimulation early in life. the role of the gut flora in this connection has been studied, but prospective studies are in demand. within the frame of a comprehensive controlled prospective primary prevention study of atopy and allergic diseases with the aim to reduce ... | 2006 | 16723280 |