title: Prevalence of rheumatoid pneumoconiosis (Caplan's syndrome) in metal miners.
mesh_terms: D000328:Adult; D002205:Caplan Syndrome / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008670:Metals; D008875:Middle Aged; D008906:Mining
chemical_list: D008670:Metals