1. National survey of prevalence of asthma among children in the United States 1976 to 1980;Gergen, P.J.; Mullally, D.I.; Evans, R.;Pediatrics
2. Has the prevalence of asthma changed? Evidence from the national study of health and growth;Burney, P.G.J.; Chinn, S.; Rona, R.J.;Br Med J,1973
3. Recent trends in the prevalence and severity of childhood asthma;Weitzman, M.; Gortmaker, S.L.; Sobol, A.M.; Perrin, J.M.;JAMA,1992
4. Prevalence of asthma and hay fever in England and Wales;Fleming, D.M.; Crombie, D.L.;Br Med J,1987
5. Epidemiological trends in bronchial asthma;Sears, M.,1991