Kokelj, Spela Intra-individual variation of particles in exhaled air and of the contents of Surfactant protein A and albumin. [electronic resource] - PloS one 2020 - e0227980 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 1932-6203 Standard No.: 10.1371/journal.pone.0227980 doi Subjects--Topical Terms: AdultAgedAir--analysisAlbumins--isolation & purificationBiomarkers--chemistryBreath TestsExhalation--physiologyFemaleHealthy VolunteersHumansMaleMiddle AgedPulmonary Disease, Chronic Obstructive--diagnosisPulmonary Surfactant-Associated Protein A--isolation & purificationRespiratory System--chemistrySpirometry--methods