title: On some preclinical symptoms of alcoholism in miners.
mesh_terms: D000041:Absenteeism; D000437:Alcoholism / Q000453:epidemiology*; D002031:Bulgaria; D003032:Coal Mining; D001068:Feeding and Eating Disorders / Q000453:epidemiology; D006801:Humans; D012893:Sleep Wake Disorders / Q000453:epidemiology