Prevalence of coronary heart-disease in elderly coal-workers.
D000368:Aged; D003031:Coal; D003327:Coronary Disease / Q000706:statistics & numerical data*; D006801:Humans; D008906:Mining; D009784:Occupational Diseases; D015995:Prevalence
D003031:Coal
CORONARY DISEASE/statistics; MINING; OCCUPATIONAL DISEASES