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Persistent wheeze:its relation to respiratoryillness,cigarette smoking,and level of pulmonaryfunction in a population sample of children. Weiss ST,Tager IB,Speizer FE,Rosner B. The American Review of Respiratory Disease . 1 980
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Influence of family factors on theincidence of lower respiratory illness during the firstyear of life. Leeder S,Corkhill R,Irwig LM,Holland WW,Colley JRT. British Journal of Preventive and Social Medicine . 1 976