Beasley, R., Weatherall, M., Black, P., Shaw, D., Tranquilino, T., Mackey, B., …Black, P. (2014). Predictors of Severe Exacerbations, Poor Asthma Control, and β-Agonist Overuse for Patients with Asthma. Journal of Allergy and Clinical Immunology: In Practice, 2(6), 751-758.e1. https://doi.org/10.1016/j.jaip.2014.06.001