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. 2012 Oct 8;2(5):e000973. doi: 10.1136/bmjopen-2012-000973

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Mean and SD for measured surfactant protein D values (μg/l) at various time points (0–8 h) of the study. Exposure to pool environment or filtered air took place for 2 h (between 0 and 2 h). Group A: previously unexposed healthy volunteers. Group B: pool workers.