1.
Shi F, Qiu C, Yu J, Yang Y, Li B, Feng M, Zhang T, Liu W. Comparison of Fractional Exhaled Nitric Oxide in Elderly Patients with Asthma-chronic Obstructive Pulmonary Disease Overlap and Other Airway Inflammatory Diseases. Iran J Allergy Asthma Immunol. 2018;17(3):232-239.