title: Factors contributing to the clinical grade of breathlessness in coalworkers with pneumoconiosis.
mesh_terms: D000874:Anthracosilicosis / Q000503:physiopathology*; D001991:Bronchitis / Q000503:physiopathology; D004417:Dyspnea / Q000503:physiopathology*; D006801:Humans; D008168:Lung / Q000503:physiopathology; D008176:Lung Volume Measurements; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood; D005082:Physical Exertion; D012907:Smoking / Q000503:physiopathology
chemical_list: D010100:Oxygen