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2. Prevalence of childhood asthma: facts, tendencies and interpretations;Sennhauser;Agents Actions,1993
3. A high incidence of asthma and respiratory symptoms in 4–11 year old children;Ayres;Respir Med,1992
4. Prevalence of asthma in regional Victorian schoolchildren;Robertson;Med J Aust,1992
5. Prevalence of asthma in Melbourne schoolchildren: changes over 26 years;Robertson;Br Med J,1991