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Respiratory symptoms, bronchitis and asthma in children of Central and Eastern Europe
G.S. Leonardi, D. Houthuijs, B. Nikiforov, J. Volf, P. Rudnai, J. Zejda, E. Gurzau, E. Fabianova, T. Fletcher, B. Brunekreef
European Respiratory Journal 20 (4) 890-898; DOI: 10.1183/09031936.02.00260802 Published 1 October 2002