[The importance of work hours from the point of view of the development of stomach diseases and ulcer in miners].
D003032:Coal Mining; D006801:Humans; D009787:Occupational Medicine; D010507:Periodicity; D013270:Stomach; D013272:Stomach Diseases; D013276:Stomach Ulcer; D014456:Ulcer; D014937:Work
COAL MINING; INDUSTRIAL MEDICINE; PERIODICITY; STOMACH; STOMACH ULCER