title: Previous back syndromes and present back symptoms in concrete reinforecment workers.
mesh_terms: D000328:Adult; D001416:Back Pain / Q000453:epidemiology* / Q000209:etiology; D005221:Fatigue / Q000453:epidemiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology*; D010146:Pain / Q000453:epidemiology; D012585:Sciatica / Q000453:epidemiology