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Data concerning the determinants of sputum eosinophilia and bronchial hyper-responsiveness (BHR) in large cohorts of individuals with normal lung function are limited. Here, we assessed the occurrence of sputum eosinophilia and BHR and identified the risk factors for these variables in two populations living in North Karelia, Finland, and in Pitkaranta, the Republic of Karelia, Russia. These areas...
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