Asthma remains a common and serious public health problem affecting 24 million people in the United States (US). The disease accounts for 1.6 million emergency department visits and 10.5 million physician's office visits each year in the US [3]. Asthma prevalence rates are higher among specific populations such as children, females, ethnic minorities, and those living below the poverty level; many of these groups also have higher rates of asthma related morbidity and mortality [4]. African-Americans with asthma experience disproportionate rates of morbidity and mortality compared to Caucasians [5].
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