RT Journal Article SR Electronic T1 National income, self-reported wheezing and asthma diagnosis from the World Health Survey JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society DO 10.1183/09031936.00027509 A1 G. Sembajwe A1 M. Cifuentes A1 S. Tak A1 D. Kriebel A1 R. Gore A1 L. Punnett YR 2009 UL http://erj.ersjournals.com/content/early/2009/09/09/09031936.00027509.abstract AB