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Background Previous studies have suggested that folate may provide protection against various chronic conditions. Methods We examined the effect of serum folate concentration on mortality and chronic disease incidence in a nationally representative sample of 3059 adults of the National Health and...
Background Geographical differences in prevalence of respiratory symptoms have been reported between countries in the EC Respiratory Health Survey (ECRHS). The differences between two neighbouring centres in the Antwerp area were surprising. We therefore extended the screening phase of this study...