npj Primary Care Respiratory Medicine (2015) 25, 15058; doi:10.1038/npjpcrm.2015.58; published online 1 October 2015 INTRODUCTION Asthma is common among US children and adults, with up to 1 in 8–11 children and 1 in 13 adults having received a physician diagnosis of asthma.1,2 Asthma ...