Lichong SHEN, Qingran YAN and Xiaoxiang CHEN (2020) “Efficacy of Combination Therapy With Pirfenidone and Low-Dose Cyclophosphamide for Refractory Interstitial Lung Disease Associated With Connective Tissue Disease: A Case-Series of Seven Patients”, Archives of Rheumatology, 35(2), pp. 180–188. doi: 10.46497/ArchRheumatol.2020.7381.