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2. Changes in asthma prevalence: two surveys 15 years apart;Burr, M.L.; Butland, B.K.; King, S.; Vaughan-Williams, E.;Arch Dis Child,1989
3. Changes in the prevalence of respiratory symptoms: two surveys 25 years apart;Ninan, T.K.; MacDonald, L.; Russell, G.;Thorax,1991
4. Spectrum of asthma in children - I, clinical and physiological components;McNicol, K.N.; Williams, H.B.;BMJ,1973
5. Influence of family factors on asthma and wheezing during the first five years of life;Leeder, SR, Corkhill; RT, Irwig; LM, Holland; W.W.;British Journal of Preventive and Social Medicine,1976