Aso, Shotaro, et al. “Systemic Glucocorticoids Plus Cyclophosphamide for Acute Exacerbation of Idiopathic Pulmonary Fibrosis: A Retrospective Nationwide Study”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 36, no. 2, June 2019, pp. 116-23, https://doi.org/10.36141/svdld.v36i2.7181.