1. Changes in asthma prevalence: two surveys 15 years apart;Burr, M.; Butland, B.; King, S.; Vaughan-Williams, E.;Arch Dis Child,1989
2. Respiratory symptoms and atopy in Aberdeen schoolchildren: evidence from two surveys 25 years apart;Ninan, T.; Russell, G.,1992
3. Changing prevalence of asthma in Australian children;Peat, J.; van den Berg, R.; Green, W.; Mellis, C.; Leeder, S.; Woolcock, A.;BMJ,1994
4. Effect of air pollution on the prevalence of asthma and allergy: lessons from the German reunification;Magnussen, H.; Jorres, R.; Nowak, D.;Thorax,1993
5. Prevalence of asthma and allergic disorders among schoolchildren in united Germany: a descriptive comparison;von Mutius E; C, Fritzsch; SK, Weiland; G, Roll; H, Magnussen;BMJ,1992