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3. National survey of prevalence of asthma among children in the United States, 1976 to 1980;Gergen, J.; Mullally, D.I.; Evans, R.;Pediatrics,1988
4. Prevalence of asthma in adults in Busselton, Western Australia;Peat, J.K.; Haby, M.; Spijker, J.; Berry, G.; Woolcock, A.J.;BMJ,1992
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