1. American Lung Association. Trends in asthma morbidity and mortality. American Lung Association Epidemiology & Statistics Unit Research and Program Services July 2006.
2. Racial disparities in childhood asthma in the United States: Evidence from the National Health Interview Survey, 1997 to 2003;McDaniel;Pediatrics,2006
3. United States Environmental Protection Agency.
4. Perennial allergen sensitisation early in life and chronic asthma in children: A birth cohort study;Illi;Lancet,2006
5. The natural history of asthma;Reed;J Allergy Clin Immunol,2006