Becker, M. O., M. Radic, K. Schmidt, D. Huscher, R. Arne, M. Michelfelder, C. Meisel, R. Ewert, G. R. Burmester, and G. Riemekasten. “Serum Cytokines and Their Predictive Value in Pulmonary Involvement of Systemic Sclerosis”. Sarcoidosis, Vasculitis and Diffuse Lung Disease, vol. 36, no. 4, Dec. 2019, pp. 274-8, doi:10.36141/svdld.v36i4.7612.