Aso, Shotaro, Hiroki Matsui, Kiyohide Fushimi, and Hideo Yasunaga. “Systemic Glucocorticoids Plus Cyclophosphamide for Acute Exacerbation of Idiopathic Pulmonary Fibrosis: A Retrospective Nationwide Study”. Sarcoidosis vasculitis and diffuse lung disease 36, no. 2 (June 6, 2019): 116-123. Accessed December 15, 2019. https://mattioli1885journals.com/index.php/sarcoidosis/article/view/7181.