Relationship of fractional exhaled nitric oxide with blood eosinophilia in characterizing type-2 airway inflammation in treatment-naïve patients with chronic obstructive pulmonary disease. Monaldi Arch Chest Dis [Internet]. 2025 Jul. 21 [cited 2025 Jul. 22];. Available from: https://www.monaldi-archives.org/macd/article/view/3315