Change in gait speed and adverse outcomes in patients with idiopathic pulmonary fibrosis: a prospective cohort study - Nolan, CM; Schofield, SJ; Maddocks, M; Patel, S; Barker, RE; Walsh, JA; Polgar, O; George, PM; Molyneaux, PL; Maher, TM; Cullinan, P; Man, WD-C (Respirology, 2023)