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 Oct 2002, 20 (4) 890-898; DOI: 10.1183/09031936.02.00260802