Costabel, Ulrich, Carlo Albera, Williamson Z. Bradford, Phil Hormel, Talmadge E. King, Jr., Paul W. Noble, Steven A. Sahn, Dominique Valeyre, and Roland M. du Bois. 2014. “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 31 (3):198-205. https://mattioli1885journals.com/index.php/sarcoidosis/article/view/3222.