Stefanantoni, K., I. Sciarra, M. Vasile, R. Badagliacca, R. Poscia, M. Pendolino, C. Alessandri, C.D. Vizza, G. Valesini, and V. Riccieri. “Elevated Serum Levels of Macrophage Migration Inhibitory Factor and Stem Cell Growth Factor β in Patients With Idiopathic and Systemic Sclerosis Associated Pulmonary Arterial Hypertension”. Reumatismo 66, no. 4 (March 31, 2015): 270-276. Accessed September 16, 2021. https://www.reumatismo.org/index.php/reuma/article/view/reumatismo.2014.774.