Safety and Efficacy of BI 1015550, a Preferential Inhibitor of Phosphodiesterase 4B, in Patients with Idiopathic Pulmonary Fibrosis: a Phase 2 Trial* - Koschel, D; Richeldi, L; Azuma, A; Cottin, V; Hesslinger, C; Stowasser, S; Valenzuela, C; Wijsenbeek, M; Zoz, D; Voss, F; Maher, T (Pneumologie, 2023)