Prevalence of bronchitis and airway obstruction in American bituminous coal miners.
D000328:Adult; D000367:Age Factors; D000402:Airway Obstruction / Q000453:epidemiology*; D001991:Bronchitis / Q000453:epidemiology* / Q000503:physiopathology; D003032:Coal Mining; D006801:Humans; D008297:Male; D008875:Middle Aged; D009790:Occupations; D012123:Pulmonary Ventilation; D012129:Respiratory Function Tests; D014481:United States; D014797:Vital Capacity