1. Epidemiology of childhood asthma;Sears;Lancet,1997
2. Worldwide variations in the prevalence of asthma symptoms: the International Study of Asthma and Allergens in Childhood [ISAAC];The International Study of Asthma and Allergens in Childhood [ISAAC] Steering Committee.;European Respiration Journal,1998
3. Shaw A McMurn A Field J. The Scottish Health Survey 1998. 2002 http://www.show.Scot.nhs.uk/Scottishhealthsurvey/sh803-16.html
4. Has the prevalence of asthma increased in children? Evidence from the national study of health and growth 1973-86;Burney;British Medical Journal,1990
5. Trends in prevalence and severity of childhood asthma;Anderson;British Medical Journal,1994