Zein JG, Dweik RA, Comhair SA, Bleecker ER, Moore WC, Peters SP, Busse WW, Jarjour NN, Calhoun WJ, Castro M, Chung KF, Fitzpatrick A, Israel E, Teague WG, Wenzel SE, Love TE, Gaston BM, Erzurum SC. Asthma Is More Severe in Older Adults. PLoS One. 2015; 10(7):e0133490.