Zanini, A., S. Della Patrona, A.L. Facchini, and A. Spanevello. “Induced Sputum in the Management of COPD: Clinical Implications”. Monaldi Archives for Chest Disease 77, no. 1 (December 3, 2015). Accessed April 20, 2024. https://www.monaldi-archives.org/macd/article/view/163.