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Symptoms related to asthma and chronic bronchitis in three areas of Sweden
E Bjornsson, P Plaschke, E Norrman, C Janson, B Lundback, A Rosenhall, N Lindholm, L Rosenhall, E Berglund, G Boman
European Respiratory Journal 7 (12) 2146-2153; Published 1 December 1994
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