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We read with great interest the letter by Wjst proposing an alternative hypothesis for margarine supplementation by vitamin D as the risk factor underlying its positive associations with asthma and allergies. In our recently published study (Thorax 2007;62:677–83), we found that margarine intake was a risk factor for asthma and rhinitis symptoms among children in Crete. We hypothesised that the high concentration …
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Competing interests: None.