Factors influencing expiratory flow rates in coal miners.
D000328:Adult; D003032:Coal Mining; D006801:Humans; D008448:Maximal Expiratory Flow Rate; D008875:Middle Aged; D011009:Pneumoconiosis / Q000503:physiopathology*; D012044:Regression Analysis; D012907:Smoking / Q000150:complications / Q000503:physiopathology