1. Data Fact Sheet: Asthma statistics. US Department of Health and Human Services,1989
2. Is the prevalence of asthma changing?;Anderson;Arch Dis Child,1989
3. National Center for Health Statistics. Vital and health statistics: current estimates from the National Health Interview survey. US Department of Health and Human Services, 1982-1993.
4. National survey of prevalence of asthma among children in the United States, 1976 to 1980;Gergen;Pediatrics,1988
5. A community based study of the epidemiology of asthma: incidence rates, 1964-1983;Yunginger;Am Rev Respir Dis,1992