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In westernised countries, up to a third of children currently have asthma. Part of this “epidemic” has resulted from a change in diagnostic criteria. In Aberdeen in 1964, asthma was diagnosed in 73 of 261 (28%) participating children with wheeze, in 1989 in 331 of 675 (49%), and in 1994 in 654 of 1025 (64%). Thus, even if the prevalence of wheeze had(More)
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