Early detection of expiratory airflow obstruction in cement workers.
D000328:Adult; D000402:Airway Obstruction / Q000175:diagnosis*; D000403:Airway Resistance; D003252:Construction Materials; D004781:Environmental Exposure; D006801:Humans; D008875:Middle Aged; D009784:Occupational Diseases / Q000139:chemically induced* / Q000175:diagnosis; D013147:Spirometry; D013997:Time Factors; D014797:Vital Capacity