J Allergy Clin Immunol 123 : 146152.e8 Comhair SA, Ricci KS, Arroliga M, Lara AR, Dweik RA, Song W, Hazen SL, Bleecker ER, Busse WW, Chung KF, Gaston B, Hastie A, Hew M, Jarjour N, Moore W, Peters S, Teague WG, Wenzel SE, Erzurum SC 2005 Correlation of systemic superoxide dismutase deficiency to airflow obstruction in asthma
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Reference Rosenstock J et al
They are generally safer than injections but can cause stomach upset and, rarely, allergic reactions