Longitudinal clinical outcomes in a real-world population of patients with idiopathic pulmonary fibrosis: the PROOF registry oleh Wim A. Wuyts, Caroline Dahlqvist, Hans Slabbynck, Marc Schlesser, Natacha Gusbin, Christophe Compere, Sofie Maddens, Yuan-Chi Lee, Klaus-Uwe Kirchgaessler, Karen Bartley, Benjamin Bondue