Relationship of pulmonary impairment in simple coal workers' pneumoconiosis to type of radiographic opacity.
D000403:Airway Resistance; D003032:Coal Mining; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D008170:Lung Compliance; D008297:Male; D010993:Plethysmography, Whole Body; D011009:Pneumoconiosis / Q000000981:diagnostic imaging*; D011859:Radiography; D012129:Respiratory Function Tests; D012907:Smoking; D013147:Spirometry