Favalli, E., F. Ingegnoli, S. Zeni, M. Faré, and F. Fantini. “HLA Typing in Systemic Sclerosis”. Reumatismo 53, no. 3 (1): 210-214. Accessed September 20, 2020. https://www.reumatismo.org/index.php/reuma/article/view/reumatismo.2001.210.