Grabowska, O., M. M. Martusewicz-Boros, D. Piotrowska-Kownacka, and E. Wiatr. “A Case Report of Steroid Resistant Cardiac Sarcoidosis Successfully Managed With Methotrexate”. Sarcoidosis Vasculitis and Diffuse Lung Disease, Vol. 35, no. 2, July 2018, pp. 178-81, http://mattioli1885journals.com/index.php/sarcoidosis/article/view/6554.