Biomarkers of pulmonary fibrosis in bronchoalveolar lavage fluid and saliva. Study methods and pathophysiological significance. - Ángel-Reimúndez C; Ruibal-Caballero MF; Leiro-Fernández V; Salgado-Arteta M; González-Matías LC; Fernández-Villar A; Mallo F (Frontiers in medicine, 2026)