title: Exercise capacity in coal workers' pneumoconiosis: an analysis using causal modelling.
mesh_terms: D003032:Coal Mining; D004812:Epidemiologic Methods; D006801:Humans; D008168:Lung / Q000503:physiopathology*; D005082:Physical Exertion / Q000502:physiology*; D011009:Pneumoconiosis / Q000503:physiopathology*