1. Healthcare Cost and Utilization Project (HCUP). Content last reviewed February 2017. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/data/hcup/index.html
2. Roemer, M. Health Care Expenditures for the Five Most Common Children's Conditions, 2008: Estimates for U.S. Civilian Noninstitutionalized Children, Ages 0–17. Statistical Brief #349. December 2011. Agency for Healthcare Research and Quality, Rockville, MD. http://www.meps.ahrq.gov/mepsweb/data_files/publications/st349/stat349.pdf
3. Status of Childhood Asthma in the United States, 1980–2007
4. Economic burden of asthma: a systematic review