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BackgroundPertussis and measles infection as well as vaccination have been suspected as possible mediating factors of allergic disease in childhood.
MethodsBetween 1995 and 2005 cross‐sectional studies were performed in 29 centers in 21 countries. Parental questionnaires were used to collect information on allergic diseases and exposures. We analyzed data from 54,943 randomly selected schoolchildren...
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