Tiev, K.p., et al. “Diagnostic Value of Exhaled Nitric Oxide to Detect Interstitial Lung Disease in Systemic Sclerosis”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 26, no. 1, June 2009, pp. 32-38, https://mattioli1885journals.com/index.php/sarcoidosis/article/view/2609.