Alveolar cell composition in interstitial lung disease and the development of a pulmonary progressive fibrosing phenotype: a retrospective cohort study. - Simons IA; Boerrigter BG; Hovestadt MCM; Mooij-Kalverda KA; Zhang S; Boers LS; van der Zee AHM; Nossent EJ; Duitman JW (Respiratory research, 2025)