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References
1.National Asthma Education and Prevention Program Expert Panel Report 2: Guidelines for the Diagnosis and Management of Asthma . Bethesda MD : National Institutes of Health Pub No 97-4051; 1997 .
2.National Heart Lung and Blood Institute: International Consensus Report on Diagnosis and Management of Asthma . Bethesda MD : National Institutes of Health Pub No 92-3091; 1992 .