[Functional state of cardiac muscle in coal miners].
D000328:Adult; D003032:Coal Mining; D004562:Electrocardiography; D006331:Heart Diseases / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D009784:Occupational Diseases / Q000175:diagnosis*; D014586:USSR
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