A study of discernible changes in a group of asbestotics before and after certification.
D000328:Adult; D000368:Aged; D001195:Asbestosis / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D001344:Autopsy; D003644:Death Certificates; D003937:Diagnosis, Differential; D004185:Disability Evaluation; D006801:Humans; D008875:Middle Aged; D013997:Time Factors