Costabel, U., C. Albera, W. Z. Bradford, P. Hormel, T. E. King, Jr., P. W. Noble, S. A. Sahn, D. Valeyre, and R. M. du Bois. “Analysis of Lung Function and Survival in RECAP: An Open-Label Extension Study of Pirfenidone in Patients With Idiopathic Pulmonary Fibrosis”. Sarcoidosis, Vasculitis and Diffuse Lung Disease, vol. 31, no. 3, Oct. 2014, pp. 198-05,