Heffler, Enrico, Giovanna Elisiana Carpagnano, Elisabetta Favero, Giuseppe Guida, Mauro Maniscalco, Andrea Motta, Giovanni Paoletti, et al. “Fractional Exhaled Nitric Oxide (FENO) in the Management of Asthma: A Position Paper of the Italian Respiratory Society (SIP IRS) and Italian Society of Allergy, Asthma and Clinical Immunology (SIAAIC)”. Multidisciplinary Respiratory Medicine 15 (February 19, 2020). Accessed July 7, 2024. https://mrmjournal.org/index.php/mrm/article/view/36.