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2. Guidelines for the management of asthma in adults I. Chronic asthma;Brewis, G.;British Medical Journal,1990
3. Guidelines for the management of asthma in adults II. Acute severe asthma;Brewis, G.;British Medical Journal,1990
4. Morbidity of patients with unscheduled return visits;M., Vertovec A.; M., Feldman R.; A, Cooper M.;et al,1990